The Croatian has quickly become a Hammers fan favourite.
Sunderland will face West Bromwich Albion, Newcastle United, Everton and Southampton in their next four Premier League matches.
Leeds United midfielder Alex Mowatt has to regain his form soon.
Tottenham Hotspur striker Harry Kane needs to start scoring goals.
Darren O'Dea says he 'lived the dream' playing for Celtic.
Henri Lansbury has been in brilliant form for Nottingham Forest so far this season.
Arsenal's Alexis Sanchez can't stop scoring.
The 30-year-old may have a more important role than anyone at the club under his new manager.
Michail Antonio is struggling to get into the West Ham United team after joining from Nottingham Forest in the summer transfer window.
Newcastle United summer signing Florian Thauvin needs to show what he is all about.