Manchester United have been linked with a big move for Atletico Madrid midfielder Koke.
United are thought to have named the Spanish midfielder as one of their key transfer targets, as boss Louis Van Gaal looks to add more creativity to his squad this January.
However, Atletico are in rush to sell and they are playing hard ball about any possible deal.
But according to the Daily Mirror website van Gaal is ready to force them to do business by activating the mammoth clause.
However, they will have a battle on their hands as Chelsea and Manchester City are also keen on a deal.