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"I think it's wrong to say things like this because he's involved in the games against United and West Ham won against them the last three games. I don't think it's a good idea to say things like this," Grant told Skysports.com.
Manchester United will host West Ham on Saturday while Chelsea will face Newcastle.
Curbishley praised Sir Alex Ferguson and said, in a recent newspaper column, it will be a great injustice if United did not retain their Premier League title.
"I'm not doubting the integrity of West Ham and there is no reason to doubt the integrity of Alan Curbishley," added the Chelsea boss.
Manchester United and Chelsea have each 81 points with only two matches left to play but Alex Ferguson's men are in the lead courtesy to a better goal difference.