a stiff task to stay in the Championship than to get out of League One perhaps. It was a different feeling and one which will take a bit of time to sink in." During his three years at the club, Mousinho made 127 appearances and captained the club to consecutive promotions from League Two to the Championship. Oxford United Despite starting in Burton's first two matches of the 2017–18 season, Mousinho did not play again for the remainder of the month. He subsequently left Burton by mutual consent on 31 August 2017, signing a two-year deal with Oxford United on the same day. Burton manager Nigel Clough stated he had advised Mousinho "that if he had the opportunity to get a longer contract with a club which was also further south and that was the best thing for him then we wouldn't stand in his way. He has been a magnificent player for the club. It will be sad to lose him. He made his Oxford United debut in a 3–0 home victory over Gillingham on 9 September 2017. Following an injury to team-mate Curtis Nelson, Mousinho was appointed club captain on 17 November 2017. He scored his first goal for the Oxford in the club's final home game of the season, scoring a penalty kick to restore parity in an eventual 2–1 win against Rochdale on 28 April 2018. He made 44 appearances during his first season with the club. Mousinho made 43 appearances during the 2018–19 season, scoring twice, as Oxford remained in League One following a 12th-place finish. Mousinho made 33 appearances for Oxford during the 2019–20 season, before the regular season was curtailed because of the COVID-19 pandemic in March 2020. He signed a new one-year contract on 30 June 2020, which enabled him to play in Oxford's League One play-off matches, the club having finished in fourth place, determined on an unweighted points-per-game basis. He made one appearance in the play-offs, as Oxford were defeated by Wycombe Wanderers in the 2020 EFL League One play-off Final on 13 July 2020. Having managed "a longstanding knee problem", Mousinho suffered a knee injury in an EFL Cup match against Watford in the opening month of the 2020–21 season. The injury ultimately ruled him out for six weeks, during which he was a part of Oxford manager Karl Robinson's first-team coaching staff. He suffered a recurrence of the