Sunderland have been fined by the Premier League after they fielded an ineligible player in four league matches earlier in the season.
Striker Ji Dong-Won, 22, played against Fulham, Southampton, Crystal Palace and Manchester United before Sunderland informed the Premier League they had made an administrative error.
It is understood they were made aware of the error in December and Sunderland settled the fine in early 2014.
The club will not suffer points deduction.
