5 Premier League stars who can't afford to have a bad season in 2017/18

2) Theo Walcott - Arsenal

Walcott may not fit into Arsenal's new system

In spite of spending more than a decade at the club, Arsenal forward Theo Walcott is yet to really cement his place in the starting lineup. Once a regular on the right when his searing pace was a potent weapon for the Gunners, Walcott's decline has been startling.

Injuries stalled his career but the 28-year-old Englishman had seemingly recovered last season to have a blistering start (10 goals by December) before fading away again. The arrival of Alexis Sanchez also showed the gulf in class between the two wide forwards under Wenger.

The French manager's new 3-4-2-1 formation could spell the end of Walcott's career at Arsenal if he does not reinvent himself. It is the wing-backs who now provide width. Walcott's tactical intelligence will be put to the test but he is effectively competing with Mesut Ozil to play behind the striker.

And following the arrival of Alexandre Lacazette and the return of Danny Welbeck from injury, there is no chance he will lead the line.