PFC Levski Sofia sanctioned over racist behaviour by supporters.
UEFA also penalised nine clubs for exceeding the permitted squad cost ratio of 70 percent during the 2025 calendar year.
In addition to the financial penalty, UEFA ordered Freiburg to play their next home match in UEFA competition behind closed doors.
Under UEFA's disciplinary regulations, clubs are held responsible for the behaviour of their supporters at European fixtures.
Aston Villa accepted responsibility for delays across nine Premier League fixtures during the campaign.