Abdul-Yussuf Adedeji Adeniyi "Deji" Oshilaja (born 2 March 1993) is an English professional footballer who plays as a defender for EFL League One club Mansfield Town.

Born in Bermondsey, Oshilaja joined Cardiff City as a 16-year-old, progressing through the academy to sign his first professional contract in April 2012.

[6] He scored his first goal for Newport in the 3–0 win versus Portsmouth in the Football League Trophy match on 12 November 2013.

[7] His loan spell at Newport was extended and he returned to Cardiff City in January 2014, which he made eight appearances for the club.

[16] After making twenty-three appearances for the club, Oshilaja's performance saw him being awarded Natalie Callow Memorial Trophy for AFCW Young Player of the Year.

[18] Oshilaja was sent out on a six-month loan to Gillingham on 24 July 2015,[19] where he scored on the opening day of the season, in a 4–0 win against Sheffield United.

Having formed a strong defensive partnership with John Egan in the first half of the season, Oshilaja was recalled by Cardiff in January.

[31] He became a key player for Burton quickly (and eventually the captain) playing 30 league games in the 2021–22 season and over 40 in 2022–23 for the Brewers.