UEFA put financial fair play rules into force after withholding prize money from 23 clubs
11:21 GMT, 11 September 2012
UEFA have withheld 23 clubs' share of European prize money due to their failure to pay debts to other clubs or tax bills.
The clubs include some famous names in European football including Atletico Madrid, Sporting Lisbon, Fenerbahce and Malaga, but no British sides.
The sanctions follow the first elements of UEFA's financial fair play rules coming into force regarding unpaid debts, with the prize money temporarily withheld pending further investigation.
Euro kings: Atletico Madrid, who beat Chelsea in this year's Super Cup, are among the 23 teams who UEFA are withholding prize money from
The action was taken by the UEFA Club Financial Control Body (CFCB) investigatory chamber, chaired by former Belgian Prime Minister Jean-Luc Dehaene.
UEFA said in a statement: 'The clubs participating in UEFA club competitions had to provide information regarding the status of any overdue payables as at 30 June 2012.
'The CFCB investigatory chamber has identified that important overdue payables towards other clubs, and/or towards employees or social/tax authorities existed in 23 cases.'