Sears scored on his debut against Blackburn in Saturday's 2-1 Barclays Premier League win - and there are also hopes of James Tomkins, Jack Collison and Kyel Reid making the step up.
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."