By London correspondent Tony Hughes

Simone Zaza is set to lead the West Ham attack against Watford when the Premier League resumes on Saturday of next week.

That is the verdict of Hammers co-owner David Sullivan as he explained what the star quality that the striker will immediately bring to Slaven Bilic’s team.

Zaza joined West Ham on Monday in a loan-to-buy deal that could make him the most expensive player in the club’s history.

The Italy international will cost West Ham £5million this season in a deal that includes an obligation to make the move permanent next summer for a further £20million if he makes a certain amount of appearances.

“This has been a big few days for the club following the signing of Simone Zaza from Juventus over the weekend,” Sullivan told the West Ham website.

“Zaza could become one of the major stars and we saw his qualities when he came came on and scored at London Stadium a few weeks ago.

“He’s fit and ready to play. We expect him to lead the line against Watford.”

Zaza is expected to leapfrog the likes of Andre Fletcher and Jonathan Callieri in the pecking order at the London Stadium, where he will be the main man in the absence of injured attacking pair Andre Ayew and Andy Carroll.

The striker, who has earned 14 Italy caps, scored eight goals in 24 appearances in all competitions for Juventus during the 2015-16 campaign.

He played second fiddle to the likes of Pablo Dybala and Alvaro Morata in Turin last summer.

In other West Ham team news, the loan move of Enner Valencia to Everton has opened up a space in the West Ham attack for Fletcher and Callieri.