Ajala joined Bristol City for the 2012–13 season, signing a contract until January 2013 then to the end of the 2012–13 season. He was awarded the number 35 shirt and made his professional début for the club on 16 April 2013 in a 0–1 home defeat to Birmingham City, a match in which City were also relegated. He came on as an 89th-minute substitute for Neil Kilkenny.
Ajala joined League Two side AFC Wimbledon on a short-term loan deal in 2012. He made his debut for the Football League Two side in an FA Cup tie against Milton Keynes Dons on 2 December 2012. He made an assist for the equaliser but it proved only to be a consolation as the match ended 2–1 to MK Dons. He was recalled by Bristol City for upcoming matches.
Non-league
Ajala signed for Welling United on 31 January 2014. He played 15 times for the Wings, before leaving at the end of the season. Ajala signed a one-year deal with Torquay United on 20 July 2014. On 9 September 2015, it was announced that Ajala had signed for Dover Athletic On 4 January 2016, Ajala re-joined Torquay United, on a deal until the end of the season. Ajala signed for Gateshead in June 2016 after turning down a new deal at Torquay. Ajala joined Welling United for the second time in August 2017 and made his only appearance in the first half of the National League South 2017/18 opener versus Truro City. Ajala signed for Dartford in August 2017 and made his debut versus Oxford City on 19 August 2017. Ajala signed for Thamesmead Town in September 2017 and made seven league appearances for the club and one cup appearance. He scored his only goal in a 4–2 home defeat to Greenwich Borough on 30 September 2017. Ajala signed for Harlow Town in November 2017. He made his debut for the club in a 1–0 win over Leiston on 7 November 2017. Ajala signed for Kingstonian in February 2018 and made his debut for the club in a 1–1 draw with Folkestone Invicta on 24 February 2018. He scored his first goal for the club two weeks later, on 10 March 2018, coming off the bench to score his side's only goal in a 3–1 defeat to Leiston. Ajala signed for Ashford United in November 2018 and made his debut for the club in a 3–0 win over Greenwich Borough. Ajala spent the first half of the 2019–20 season with Glebe, before joining Romford in February 2020.