Sir Alex has pillaged Tottenham in the past for Michael Carrick and Dimitar Berbatov, but Tottenham are trying to make certain it does not happen again with Modric.
"There's no chance of it happening at all. Luka's key to everything that's happening at this place," Redknapp told the Sun.
"Everybody knows what I think of him. And if you want to move on to higher levels you don't start flogging off your best players - to anyone.
"I have an excellent squad and - I stress - Luka Modric is going to remain a part of it."