5. Kevin de Bruyne
Jose Mourinho has this week been insisted that Chelsea have learnt from their mistake when selling players after they were forced to re-sign Nemanja Matic, but another player may come back to haunt him. De Bruyne was moved on six months after Mourinho’s arrival and the forward has been a revelation at Wolfsburg this season. According to Squawka, the Belgian has assisted 15 goals this season in the Bundesliga as well as scoring eight himself, pretty decent numbers for a £15m player.