West Ham boss Gianfranco Zola has vowed that his relegation-threatened side's form will improve when their big guns return from injury

West Ham boss Gianfranco Zola has vowed that his relegation-threatened side's form will improve when their big guns return from injury.

West Ham have been missing key men such as Scott Parker, Carlton Cole, Kieron Dyer, Herita Ilunga and Jack Collison of late and with Wolves visiting the Boleyn Ground, the Italian knows how vital the next couple of months will be for the club.

"I must say that I have a team that's giving 100 per cent and if we maintain that condition, trust me, when we have everybody back this team is going to be different. It's going to be tough to beat. I can write down straight away now. That's all I can say," he said defiantly before challenging his players to produce this Sunday.

"It depends on the players we get back and it's true, we have important matches coming, starting with the one on Sunday.

"If we play that with the attitude we had against Arsenal and some of the players are back we are going to be alright."

One players' attitude that Zola was keen to praise was Alessandro Diamanti. The Italian opened the scoring on Sunday against Arsenal and was a real creative force for the Hammers.

"Diamanti is not only the goals but also his passing is very good, today in the second half he set up a couple of opportunities with his intelligent passing and also he works very hard," he said.

"He's one of the players who has become fundamental for this team. He's doing very well and he's getting better. It's a good positive note for us."

A player just as important to West Ham is Carlton Cole and Zola had some positive news as the forward looks to recover from a knee injury.

"He's making a lot of good progress. I think I don't want to force things. But I think it will be sooner rather than later so it's very encouraging. Don't ask me exactly the time because I can't say.