Oluwasemilogo Adesewo Ibidapo Ajayi (born 9 November 1993) is a Nigerian professional footballer who plays as a defender or defensive midfielder for Premier League club West Bromwich Albion and the Nigeria national football team.
Born to Nigerian parents, Ajayi began his football career as a youth product of the Charlton Athletic academy. After progressing through the Charlton Athletic ranks, he was offered his first professional contract in January 2012.
Shortly before he was due to make his debut for the Charlton first team, Ajayi caught the eye of Premier League team Arsenal. Ajayi joined the Arsenal Academy on a two-year deal after impressing as a trialist with the club in September 2013.
On 25 March 2015, Ajayi joined Championship team Cardiff City on loan until the end of the 2014–15 season but did not feature for the first team. At the end of the season, Ajayi joined Cardiff on a two-year permanent deal following the end of his contract at Arsenal.
On 30 January 2017, Ajayi signed a loan deal until the end of the 2016–17 season with fellow Championship strugglers Rotherham United. The following day, he made his Rotherham United debut, starting and playing the whole game, in a 2–0 defeat against Nottingham Forest.
West Bromwich Albion
On 20 July 2019, Ajayi signed for West Bromwich Albion for an undisclosed fee, agreeing a four-year contract with the club. On 27 December 2020, Ajayi scored his first Premier League goal for Albion in a 1–1 away draw against champions Liverpool.