The free-spending Chelsea have been hit the hardest by UEFA’s fines, with the Blues forced to pay €31 million ($36.5 million)—a record sum for a European club penalised in a single season. However, that fine could rise to as much as €91 million ($107.2 million) if they don’t meet the requisite financial targets over the next four years.

Chelsea have been fined 31 million euros ($36.50 million) by UEFA for breaches of its financial rules, while Aston Villa, Barcelona and Olympique Lyonnais were also levied with large fines, UEFA announced on Friday.

Both clubs were found to have breached the European governing body's football earning rules and squad cost rules.