Chelsea have expressed concern after West Ham United manager Alan Curbishley claimed it would be an "injustice" if Manchester United did not win this year's Premier League title.
Curbishley takes the Hammers to Old Trafford on Saturday lunchtime for a game that is likely to have a huge bearing on the destination of this year's league championship.
United could move three points clear of the second-placed Blues - who are not in action until Monday - should they win their penultimate league game.
However, Chelsea are reportedly unhappy after Curbishley issued a gushing praise of United and manager Sir Alex Ferguson, who he described as "Mr Amazing".
He wrote: "The general feeling among most managers is that they would like to see them crowned again.
"That's why I would raise a glass if United win the title. It would be, of course, a toast to Alex Ferguson, the best there is, and may ever be."
Curbishley has since attempted to play down the row by rubbishing suggestions his team - who have won their last three games against the Red Devils - would roll over at Old Trafford.
"My West Ham team are not going to roll over at Old Trafford on Saturday and surrender to Manchester United," he responded.
"Our bonus scheme only kicks in from 10th place so if we finish 11th there is nothing."