We're all well aware that Chelsea need a striker, and Jose Mourinho should look towards La Liga to bring a star forward to Stamford Bridge.
Diego Costa has been sensational for Atletico this season and would certainly add quality to the Blues' front line. He may be a slightly controversial character, but surely Mourinho can handle him...
Chelsea also need a long term replacement for Ashley Cole and Luke Shaw would be ideal for Mourinho.
They may have to battle Manchester United (as previously mentioned) for the player's signature, but he's worth battling for.