Manchester United are set to pull off a huge signing this weekend after agreeing a deal with Chelsea for Spanish playmaker Juan Mata.
A club record £37 million is the estimated figure required to land Mata, in a move that could kick-start United's season and fire them back into the race for Champions League qualification.
The news hasn't gone down so well with the likes of Arsene Wenger and Manuel Pellegrini, who feel the transfer could have a pivotal role on the outcome of this season's title race, a race it would appear United have no chance of winning.
But Mata's transfer is far from the first high profile move involving players switching between rival teams at the top level of English football.
GMS contributor Alex Brown takes at look at five of the biggest deals directly involving two of the league's main title contenders.
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