Malaga have been banned from the Champions League and all other UEFA competitions for the next season they qualify in the next four years and will see another year's ban if they do not prove they have no outstanding payments to clubs or players by March 31, 2013.
The cash-strapped Spanish side are one of nine clubs who have come under fire from UEFA's Club Financial Control Body (CFCB) adjudicatory chamber and will be punished further if they do not make changes to the way they conduct business.
The CFCB's meeting in Nyon, Switzerland on Friday saw Malaga given the harshest punishment which sees them fined €300,000 and banned for one season up until 2016-17. Another year's ban is possible if they don't provide evidence of change by March.
A statement from UEFA read: "The club is excluded from participating in the next UEFA club competition for which it would otherwise qualify in the next four seasons (i.e. 2013/14, 2014/15, 2015/16, 2016/17).
"In addition, Málaga will be excluded from a subsequent UEFA competition for which it would otherwise qualify (in the next four seasons) if it does not prove, by 31 March 2013, that it has no overdue payables towards football clubs or towards employees and/or social/tax authorities, in accordance with the UEFA Club Licensing and Financial Fair Play Regulations.
"Málaga has also been fined €300,000. The prize money withheld on 11 September 2012 (as a conservatory measure) will be released."
The ban does not effect their status in this season's Champions League, where the club will face FC Porto in the last-16. However, they are on course to finish in the top four (and qualify for Europe) at the end of the season as they currently sit in fourth behind Real Madrid.