http://www.cyberpresse.ca/article/20...0/CPACTUALITES
This is just something i found. The article is claiming that Koivu and Kovalev don't like each other, and they are writing about the possibility of one of them being traded. They say that Kovalev has been kind of separated from the rest of the Habs, and that after Koivu's return, Kovalev wasn't the same as in the regular season.
I think it's nonsense. Nothing proves that koivu and Kovy dislike each other, and kovalev wasn't the same as in the regular season already before Koivu's return.