If they do, boss Curbishley wants to keep the youngsters at the club.
"Since I've been here, that hasn't been a threat - and every indication I have is that we want to push forward," he said.
"We'll have to address it if it happens and if we get a few sniffs, but that's part and parcel of the game.
"I understand players have left here in the past - but I think perhaps it was a different situation then. For one thing, last summer was the first time for a while that we have invested as opposed to letting players leave."