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.
Mousinho had a chronic knee issue and sustained an injury in an EFL Cup match against Watford early in the 2020–21 season. The injury kept him out for six weeks, during which he was part of Oxford's first-team coaching staff under manager Karl Robinson.