Manchester City apologized to Alex Ferguson after Carlos Tevez held up a placard taunting the Manchester United manager during the club's Premier League trophy parade Monday.
Tevez held a sign with the text ''R.I.P. Fergie'' high over his head while aboard City's open-top bus, which drove through the streets of Manchester as about 100,000 fans came out to celebrate.
''The creation of the tasteless material is in itself reprehensible and in accepting and brandishing it, Carlos has made a significant error of judgment,'' City said in a statement.
''The club wishes to express its sincerest apologies to Sir Alex Ferguson and Manchester United Football Club for any offense or distress caused.''
Tevez left United to make the rare move across Manchester to City in 2009 after being unhappy at his lack of playing time under Ferguson.
''I got carried away in the excitement of the moment and I certainly didn't mean any disrespect to Sir Alex Ferguson, who I admire as a man and a manager,'' Tevez said.
The incident comes at the end of a season full of turmoil for Tevez, who spent several months in Argentina during a dispute with City which cost him more than $15 million in fines and lost earnings.
City beat United to the title on goal difference on Sunday after scoring twice in stoppage time to beat Queens Park Rangers 3-2 .
Tevez returned to City to play an influential role in their title run-in but continued to divide opinion among fans despite making peace with manager Roberto Mancini.
His performances in the closing weeks of the campaign, which included a hat trick against Norwich, were reminiscent of many in his first two seasons at the Etihad Stadium.
The 28-year-old twice finished as City's top scorer after quitting United for Eastlands three years ago and was the inspiration for last year's FA Cup win.
It was widely assumed he would still look to leave the club when he returned from his self-imposed exile in February and apologised for his conduct, but he has recently said he wants to stay.
It is unclear where he obtained the banner but he did not have it when he boarded the bus to begin the tour of the centre at Albert Square.
The meaning behind it could well be in reference to Sir Alex Ferguson's famous response to a 2009 question as to whether or not United would ever be underdogs against City. "Not in my lifetime," the Scot said.
City are celebrating their first title success in 44 years after a dramatic last-gasp win over QPR on Sunday saw them pip arch-rivals United on goal difference.
Informaton from The Associated Press was used in this report.