#1 Alexis Sanchez (Arsenal to Manchester United)

Amidst all the discussions about Alexis Sanchez's high wage structure, his reported signing on fee and the agent fees, one thing that was often ignored in this transfer window was that the acquisition of the Chilean made United a much better team than it was before.
Sanchez is a born winner, having a mentality pretty similar to that of Jose Mourinho. He can also be called a perfect Mourinho player - having the capability to win a game with a flash of brilliance and he is always willing to give that extra yard on the field. United have got a true world class player this January who has all the tools to make the club ready to compete on all fronts.
Looking at how this season has panned out, Jose Mourinho needed a player that can help him get close to Pep Guardiola and Alexis Sanchez can prove to be exactly that, a player who can help the Special One in toning down the noisy neighbours.