Semih Kaya

Kaya joined Galatasaray's youth academy from Altay's youth team when he was 15.

On 25 February 2007, when he was playing against older young players in the season of Süper Gençler Ligi (Super Youth League) against Beşiktaş, in the fifth minute of the game, a kick from Batuhan Karadeniz collided with his head, forcing him to leave the game; he later went to a hospital to undergo head surgery (coagulation).

Kaya's first Süper Lig appearance was against İstanbul B.B. on 19 February 2009.^[2] After not receiving significant playing time, he joined fellow Süper Lig club Gaziantepspor on loan in January 2010 for the remainder of the season.^[3] In the summer of 2010, he signed for Turkish First League side Kartalspor on loan.^[4] On 18 October 2010, he scored two goals in the A2 Lig game against Altay.^[5]

At the beginning of the 2011–12 season, Kaya was not typically selected for Galatasaray's starting line-up, but following injuries to other players, notably Gökhan Zan, and a fall in form of Servet Çetin, Galatasaray coach Fatih Terim granted him a chance to prove himself. Following a series of solid performances, he soon became first-choice centreback alongside the Czech Tomáš Ujfaluši.

Kaya scored his first goal for the club against Samsunspor on 7 January 2012 in the 51st minute of a 2–0 comeback, with the game ending 4–2 for Galatasaray.^[6] In the 2011–12 season, he played 30 games and was a key member of the championship-winning squad. He continued to be first choice centre-back for the club and country, delivering calm and confident performances despite against top teams such as Manchester United and, internationally, against the Netherlands. He finished his second year with 36 appearances in all competitions. On 18 November 2013, his contract was extended for three years until 2016.^[7]

In June 2014 Inter Milan was reportedly interested in Kaya.^[8]

On 14 July 2017, Kaya left Galatasaray and joined Czech club Sparta Prague, signing a three-year contract.^[9][10] He was loaned to Galatasaray on 18 January 2019, for the remainder of the 2018–19 season, with the Turkish club covering his wages.^[11] On 13 July 2020, Sparta Prague announced the departure of Kaya, after an injury-plagued spell in the Czech Republic.^[12]

On 29 September 2020, Kaya joined Yeni Malatyaspor as a free agent.^[13] He left the club on 31 January 2022 on a mutual contract termination.^[14]

On 3 February 2022, Kaya joined Galatasaray for the third time in his career.^[15] On 12 August 2022, he announced his retirement from professional football.^[16]

Kaya has played for all levels of the Turkey national team, including the under-21 level despite being at a younger age at the time. He made his debut for senior Turkish side on 29 February 2012, playing the entire game against Slovakia in a 2–1 loss.^[17] He is part of the Turkey national team for Euro 2016.^[18]

Kaya's grandfather was Macedonian Muslim or Torbeš and he emigrated from Macedonia to the Turkish city of İzmir. He is the youngest of three brothers.^[19]