Blackburn Rovers boss Steve Kean admits they can't block their young players from moving to bigger clubs.
Phil Jones will return to Rovers tomorrow with Manchester United.
"They have to play and be a part of what we are doing. Then we have to fight tooth and nail to keep them and convince them by staying, they are going to play rather than just be part of a squad.
"I appreciate it is difficult. In the case of Phil, he was being offered Champions League football and we were getting a sizeable fee.
"And I always felt he would go straight into their team anyway such is his quality.
"He has proven that. The first indication was that he received a low squad number. That suggested he was going to play a lot of games.
"He will go on to become a very good player, of that I have absolutely no doubt at all.""We can't stop developing them," said Kean.