Born in 1996 in Paris, Keita started his youth football career at the local team, Paris FC. He had been selected to attend INF Clairefontaine, and spent three years in Monaco's youth system before being released.
Virtus Entella
After trials with French clubs failed to produce a contract, Keita joined the youth team of Italian second-tier club Virtus Entella. On 17 January 2015, he was an unused substitute in a Serie B match against Bari. Early the following season, on 12 September, the player made his senior debut in Serie B against A.C. Cesena at Stadio Comunale, playing the game as a starter under coach Alfredo Aglietti. He was shown a yellow card in the 32nd minute. On 24 October, Keita was sent off after 75 minutes of the match against Bari for receiving two yellow cards. He was again sent off on 26 March 2016 against Como, this time in stoppage time. He played 32 games and was shown eleven yellow cards and two red. After considerable transfer window interest from what website TuttoB.com dubbed "half of Serie A", Keita remained with Entella. He made 14 league appearances in the first half of the 2016–17 season, with only one yellow card.
Birmingham City
On 19 January 2017, Keita signed a three-and-a-half-year contract with Birmingham City of the EFL Championship ; the fee was undisclosed. According to manager Gianfranco Zola, "Everybody speaks very highly about him in Italy and a lot of teams were interestedwe did very well to get him because everybody says he has got a big future." He made his debut on 4 February at home to Fulham, playing on the left of a makeshift back four, kept a clean sheet, and supplied the cross for Lukas Jutkiewicz's winning goal in what was judged a man-of-the-match performance. He continued in the struggling side for the next six matchesall defeatsuntil a knee injury forced him out. He was restored to the starting eleven in early April for the visit to league leaders Brighton & Hove Albion, but the Birmingham Mail correspondent thought his forward-thinking nature meant his selection was too risky while the team remained in relegation danger. He finished the season with ten appearances, as the team secured their Championship survival on the last day of the season. Keita was a second-half substitute in the opening match of the 2017–18 season, but picked up a groin injury that kept him out for a few weeks. Meanwhile, new manager Harry Redknapp signed Arsenal youngster Cohen Bramall on loan, and Bramall went straight into the starting eleven. Keita remained with Birmingham City for the 2019–20 season. He was brought into the matchday squad as cover on the left wing for an FA Cup match against Coventry City in February 2020, but was not used, and kept his place on the bench for a couple of league matches. Head coach Pep Clotet described him as "a player that is very much his own player, he has his own way of seeing the game that you either take it or you don't take it." He was released when his contract expired at the end of the season.
Loan moves
Keita returned to Italy to join Serie A club Bologna on loan for the 2017–18 season. He arrived with an adductor muscle injury that he expected to keep him out for two weeks, but remained under treatment for some considerable time longer, and did not take a full part in first-team training until well into November. After two appearances for the club's Primavera side, he was included in the squad for the Serie A match at home to Cagliari on 3 December, but remained unused. Keita finally made his Bologna and Serie A debut on 18 April 2018, away to Sampdoria, as a second-half substitute for regular left wing-backAdam Masina; he became the first Malian to play for the club. Head coach Roberto Donadoni said that he put Keita on rather than Ibrahima Mbaye because of his greater drive. Keita made his only start in his third and last appearance for Bologna, in a 3–1 defeat against top-of-the-table Juventus. He struggled against the trickery of Juan Cuadrado, and was unable to cover properly for Juventus' second goal because he was pushed by its scorer, Sami Khedira. After left-back Kristian Pedersen became Birmingham's first signing of the 2018 summer transfer window, Keita joined Eupen of the Belgian First Division A on a season-long loan. In the visit to Mouscron that "pitted the league's worst defence against the worst attack", he scored the only goalhis first at senior levelwhen Silas Gnaka's shot was parried to his feet to give his team their first points of the season in their fifth match. He missed several weeks with a muscle injury before returning to the side after the October international break. He finished the season with 24 appearances.
International career
Keita was born in France of Malian descent. He represented Mali at under-20 level, and received his first call-up to the senior team in May 2016 for a friendly against Nigeria and an Africa Cup of Nations qualifier against South Sudan, but missed out through injury. Manager Alain Giresse selected him again for a World Cup qualifier in November, but he remained an unused substitute.
