Bayern Munich president Karl-Heinz Rummenigge has called for a Europe-wide salary cap designed to curb Chelsea's dominance in the transfer market.
The former Germany striker insists the Premiership champions' ability to outspend their European rivals with Roman Abramovich's almost limitless resources is 'unacceptable'.
Rummenigge told The Guardian: 'We could have a salary cap: when a big proportion of turnover is spent on wages clubs are going into the red.
'We should have an overall salary budget capped at, say 50% of turnover. Across Europe there should be harmonisation.'
Comparing his club with Chelsea, Rummenigge added: 'We have a 200 million euro (£137.2million) turnover and Chelsea, who are owned by Roman Abramovich, have (a comparable) turnover of £146.6million.
'We make a 35 million euro (£25.4million) profit; this is required for our investment. Chelsea lost 204 million euros (£140million); Mr Abramovich obviously stumped up for it.
'This (makes for) unequal competition but we are playing against each other in the Champions League. This is not acceptable.'
Chelsea director of communications Simon Greenberg responded by saying: 'It is total nonsense to suggest that this is somehow uncompetitive or unequal.
'There are clubs who have spent more money than Chelsea in the last 10 years.'
Rummenigge's remarks come after Michael Ballack confirmed last month he was in 'serious negotiations' with the London club over a Bosman free transfer at the end of the season.