Wolves have been hit with a £25,000 suspended Premier League fine for fielding a weakened team for their 3-0 December defeat at Manchester United.
Boss Mick McCarthy made 10 changes to the side that beat Tottenham 3-0 as he rested key players ahead of the game against Burnley, which Wolves won 2-0.
McCarthy, whose side are 16th, recalled nine players to face the Clarets.
He accepted the verdict but said he aimed "only to pick a team that was in the best position to get a result".
McCarthy, whose side are currently only one point off the relegation zone, defended his team selection at the time but was much criticised by his club's travelling fans, plus United were not then in the best of form.
A Premier League statement read: "The Premier League Board has issued Wolverhampton Wanderers FC with a suspended £25,000 fine after deciding that the team fielded in their league fixture against Manchester United on 15 December 2009 was not full strength and therefore in breach of Rule E20.
"The board also deemed that the club had failed to fulfil its obligations to the league and other clubs in the utmost good faith and was therefore in breach of Rule B13.
"The board considered submissions from Wolverhampton Wanderers FC and had sympathy for the explanation submitted by the club in relation to similar cases from previous seasons.
"However, the board ruled that this case could be differentiated from the other matches cited and that disciplinary action was warranted."
The League's E20 rule stipulates that clubs must field a full-strength side in all top-flight games.
However, goalkeeper Marcus Hahnemann was the only name on the Old Trafford team-sheet that had started the victory over Tottenham at White Hart Lane three days earlier.
Former Republic of Ireland manager McCarthy said at the time: "We had a great result at Spurs and every player rated it 9 to 9.5/10 in terms of how hard it was.
"I need to protect them. If you have another match of that magnitude, you can't cope. We have big games coming."
However, his team selection prompted a furious reaction from some Wolves fans, with many of the 3,000 that travelled to Manchester asking for their money back.
Other observers claimed the selection was unfair to United's title rivals and could set a dangerous precedent.
The Premier League seem intent on ensuring clubs do not field second-string teams in the future.
Their statement continued: "In coming to this decision the board also wants to put clubs on notice that any future rule breach of this nature would be subject to a disciplinary commission that would have available a full range of sanctions."
Reacting to the fine, the Molineux club's chief executive Jez Moxey added: "This ruling may now lead to a wider discussion regarding the issue of squad rotation and the Premier League's rules.
"We look forward to fully participating in any such debate at future Premier League meetings."
Moxey, meanwhile, gave his backing to his manager, and stated: "One thing that's never been in question is the integrity of Mick McCarthy.
"He picked a team that, in his view, was in the best possible position to get a result in that particular game.
"He made it unselfishly and with the best interests of Wolves in mind."