Guilherme Costa Marques (born 21 May 1991), known simply as Guilherme, is a Brazilian professional footballer who plays as a midfielder for Campeonato Brasileiro Série B club Atlético Goianiense.
Born in Três Rios, Brazil, Guilherme began playing futsal and trained at a football school, having started out playing in the streets. He started out playing in five-a-side before switching to eleven-a-side. As Guilherme grew older, he began to take football seriously. Guilherme then started out his career at Paraíba do Sul before moving to Portugal, where he joined Braga in 2009 at age sixteen. Immediately after joining the club, Guilherme was assigned to the youth team.
Guilherme made his SC Braga first team debut on 24 January 2010, starting the whole game, in a 4–1 win over Leiria. He also appeared as an unused substitute in a league match against Vitória on 6 March 2010. For the remaining part of the 2009–10 season, Guilherme appeared in a number of matches as an unused substitute, as he made one appearance for the side.
Ahead of the 2010–11 season, Guilherme was promoted to Braga's senior squad. His first appearance of the season came on 21 August 2010, coming on as a second–half substitute, in a 0–0 draw against Vitória. On 22 January 2011, he scored his first goal of the season, in a 2–2 draw against Vitória. Eight days later, on 30 January 2011, Guilherme scored again in the third round of Taça da Liga, in a 4–0 win over Arouca. At the end of the 2010–11 season, he went on to make eight appearances and scoring once in all competitions. During the season, Guilherme was linked a move away from SC Braga, as Juventus, Manchester City and FC Barcelona were interested in signing him.
Guilherme made his first appearance of the 2011–12 season against BSC Young Boys in the second leg of the UEFA Europa League qualifying play-off round on 25 August 2011, where he came on as a 61st-minute substitute and set up a goal for Lima in a 2–2 draw and saw SC Braga go through to the Group Stage, thanks to away goal. After spending the 2011–12 season on loan at Gil Vicente, Guilherme was sent to the Braga B team for the whole 2012–13 season. At Braga B team, he received a handful of playing time despite being called up from the senior team. However, Guilherme had discipline issues, receiving thirteen yellow card and two red cards, coming against Tondela and F.C. Penafiel on 2 September 2012 and 7 October 2012 respectively. Despite this, he went on to make twenty–six appearances and scoring four times for Braga B team.
It was announced on 19 June 2013 that Guilherme's future at the SC Braga was in doubt, as his homeland clubs were becoming more interested in signing him. After a failed move, he spent the rest of the year, training for the reserve side. It was announced on 10 January 2014 that Guilherme was expected to leave SC Braga, either having his contract terminated or on loan.
In the first part of the following season, Guilherme was loaned to Segunda Liga side Vizela. He went on to make seven appearances for the side.
For the 2011–12 season, Guilherme was loaned out to Gil Vicente for the rest of the season. He made his debut for the club, coming on as a second-half substitute, in a 2–2 draw against Olhanense on 16 September 2011. A month later on 27 October 2011, he scored his first Gil Vicente goal, coming from a penalty spot, in a 2–1 loss against Belenenses in the Taça da Liga campaign. Guilherme appeared in the Taça da Liga final against S.L. Benfica, coming on as a 67th-minute substitute, as the club went on to lose 2–1. At the end of the 2011–12 season, he went on to make twenty–six appearances and scoring once in all competitions.
On 14 January 2014, it was announced that Guilherme was loaned out to Legia Warsaw for the next twelve months. Upon joining the club, Guilherme became the twelve Brazilian player to join Legia Warsaw.
Guilherme made his Legia Warsaw debut on 14 February 2014, starting the match before being substituted in the 74th minute, in a 1–0 win over Korona Kielce. After making his second appearance for the club, he, however, suffered a ruptured intraarticular ligament initiation in the ankle that saw him out until the end of the 2013–14 season. By the time he suffered a rupture to his ankle, Guilherme went on to make two appearances for the side this season. Despite this, he went on to win February's Player of the Month by Legia Warsaw supporters. During his absent from injury, the club went on to win the league.
At the start of the 2014–15 season, Guilherme remained out of the first team, due to suffering from injury. On 17 October 2014, he returned from injury, coming on as a 78th-minute substitute, as Legia Warsaw beat Lechia Gdańsk 1–0. Four days later, on 22 October 2014, Guilherme made his first start as a left–back since returning from injury, in a 1–0 win over Metalist Kharkiv in the group stage of the UEFA Europa League. Since returning to the first team from injury, he regained his first team place, playing in the left–back position. On 14 January 2015, it was announced that Guilherme signed for Legia Warsaw on a permanent basis, signing a three–year contract. After losing his place by the returning Tomasz Brzyski, he regained his first team place, playing in the attacking position, although he occasionally played at the left–back position. On 29 April 2015, Guilherme scored his first goal for the club, scoring from an equaliser, in a 2–1 win against Pogoń Szczecin. Three days later, on 2 May 2015, he started in the Polish Cup final against Lech Poznań (who went on to win the league), only for him to be substituted in the 37th minute, as Legia Warsaw won 2–1. Despite being sidelined several times later in the 2014–15 season, Guilherme went on to make thirty appearances and scoring once for the side.
At the start of the 2015–16 season, Guilherme remained in the first team regular for the side, where he played in the right–wing position despite competing with Michał Kucharczyk. He scored his first goal of the season in the second leg of the UEFA Europa League third round against FC Botoșani, as Legia Warsaw won 3–0 to advance to the next round. A month later on 27 August 2015, Guilherme scored his second goal of the season in the second leg of the UEFA Europa League play–offs round against Zorya Luhansk, as the club won 3–2 to advance to the Group Stage. Three days later on 30 August 2015, he scored the opening goal of the game, in a 1–1 draw against Jagiellonia Białystok. On 31 October 2015, Guilherme scored his fourth goal of the season, in a 3–1 win against Lechia Gdańsk. On 20 December 2015, he scored his fifth goal of the season, as well as, providing two assists, in a 3–1 win against Korona Kielce. His performance at Legia Warsaw attracted interests from Serie A side Inter Milan, but the move never happened. After being sidelined on two separate matches between late–February and early–March, Guilherme scored on his return from injury, in a 2–1 win over KS Cracovia on 12 March 2016. In the second leg of the semi–final of the Polish Cup against Zawisza Bydgoszcz on 6 April 2016, he came on as a 52nd-minute substitute and scored the winning goal, in a 2–1 win to reach the final for the second time in a row. In the Polish Cup final against Lech Poznań, Guilherme came on as a 67th-minute substitute and helped Legia Warsaw win 1–0 to win the tournament. Six days later on 8 May 2016, he scored his eighth goal of the season, in a 4–0 win against Piast Gliwice. In a follow–up match against Pogoń Szczecin, Guilherme set up the third of the game to help club win 3–0, a win that saw the club win the league. At the end of the 2015–16 season, he went on to make 55 appearances and scoring 8 times in all competitions.
At the start of the 2016–17 season, Guilherme scored Legia Warsaw's first goal of the season, in a 4–1 loss against Lech Poznań in the Polish SuperCup. However, he soon suffered a shoulder injury during a 2–0 win over Zrinjski Mostar in the second leg of the UEFA Champions League second round and was sidelined for a month. After being out for a month, Guilherme returned from injury on 20 August 2016 against Arka Gdynia, coming on as a second-half substitute and set up a goal for Kasper Hämäläinen, in a 3–1 loss. Since returning from a shoulder injury, he regained his first team place, playing in the right–wing position. On 1 October 2016, Guilherme scored a brace, scoring the club's first and second goals of the game, in a 3–0 win over Lechia Gdańsk. On 28 October 2016, he played a role in the match by scoring Legia Warsaw's first goal of the game and set up the club's second goal of the game, in a 4–2 win against Arka Gdynia. On 18 November 2016, Guilherme scored his fifth goal of the season, in a 4–2 win against Jagiellonia Białystok. On 7 December 2016, he scored his first UEFA Champions League goal, in a 1–0 win over Sporting CP, their first win of the UEFA Champions League's Group Stage. However, Guilherme suffered both suspension and a thigh injury that saw him out for two months. While out with a thigh injury, Legia Warsaw opened a contract negotiation to convince him to stay at the club beyond 2018, whose contract was expected to expire. On 11 February 2017, he returned from injury, coming on as a 76th-minute substitute, in a 1–0 win against Arka Gdynia. However, his return was short–lived when Guilherme missed one match, due to suspension for picking up five yellow cards this season. After serving a one match suspension, he returned to the starting line–up, in a 2–1 win against KS Cracovia on 22 April 2017. On 14 May 2017, Guilherme scored his seventh goal of the season and set up one of the goals, in a 6–0 win against Bruk-Bet Termalica Nieciecza. In the last game of the season against Lechia Gdańsk, he started the whole game, in a 0–0 draw, a result that saw club won the league for the second time in a row. At the end of the 2016–17 season, Guilherme went on to make forty–one appearances and scoring seven times in all competitions.