Chelsea FC haven't put a foot wrong in the Premier League so far following five successive wins to secure top spot in the English top flight.
But who will Sarri pick to lead the line at the London Stadium?
And despite Hazard's impressive start to the new season, Zola says the Belgian is still not "at his best" and can continue to improve.
Even though the Hammers are now languishing at the bottom but clearly Manuel Pellegrini's men have the firepower to cause an upset which Maurizio Sarri will be very much aware of.
Chelsea drop first points of season in draw at West Ham
"Every player has to be himself - but for me Scholes was one of the best ever", he told The Sun.
Zabaleta will surely hold all the aces with a good display in Sunday's home fixture against Chelsea, as he will be coming up against arguably the best player in the Premier League right now.
But, while the Hammers fans sweat on Arnautovic's fitness, Chelsea supporters will enjoy seeing the return of Hazard as the Blues aim to make it six wins from six at the start of the season, and having made five changes for the Europa League win then Sarri could bring back the likes of Mateo Kovacic and David Luiz, who both missed the PAOK tie.
The Spain worldwide missed a couple of chances in Chelsea's 1-0 win against PAOK in the Europa League. 'I know in London there are a lot of them with different teams.
Giroud, 31, limited to substitute appearances before last week, is yet to score for Chelsea this season but already has three assists in the Premier League. "I want to play as many games as I can and try to be as efficient as I can for the team".