The Blues boss is confident that the Germany international will deliver on his potential in the long-term at Stamford Bridge

The Blues boss has used three primary systems during his tenure, but none seem to play to the strengths of the club's struggling summer signings

The Germany international has been finding the going tough of late, but he was back on the scoresheet in an FA Cup win over Morecambe

The London club have progressed to the fourth round with the trio - including two much-maligned summer signings - playing a key role

The Blues legend believes the Germany international frontman should be used on the flanks and expects the under-fire manager to turn things around