If Chelsea do make a late move for their former academy player, it would leave West Ham needing to bring in a last-ditch replacement.
But Irvine says there is no one on their radar - because he and manager David Moyes do not want to sell the England midfielder.
"We haven't been looking to replace him," said assistant manager Irvine.
"We have been looking for players but we've not been looking for a replacement for Declan because we don't have any intention of selling him.
"Every player in the world has his price, it would certainly be an extremely difficult situation for us if anything was to happen.
"But without having all the information I still don't think that will happen."