#1 David de Gea (Manchester United)
And definitely, the best player who can sign a pre-contract with another club in this transfer window is David de Gea. Is there any manager in the world who wouldn't want to have the Spanish goalkeeper in his squad?
Over the years, de Gea has become one of the best goalkeepers in the world. In the last 5 years, de Gea won the award for Machester United 'Player of the Year' on 4 occasions.
Manchester United board has a tough task to keep their best player and convince him to stay at the Old Trafford. However, the future doesn't look bright for the Red Devils as they don't look to have a strict plan for the upcoming period. They don't look like a side that is capable of battling for the biggest trophies and that could tempt de Gea to leave the club. He can sign a pre-contract with any club this January in an attempt to resolve his future.