David Moyes has said Javier "Chicharito" Hernandez could miss two weeks with a hamstring strain and warned West Ham record signing Marko Arnautovic to start pulling his weight.
Speaking at a news conference before his first game in charge of the Londoners at Watford on Sunday, Moyes said: "I think everyone knows he [Chicharito] has got a hamstring injury. It could take a week, it could take two weeks."
Moyes has told Hernandez he will be given the chance to establish himself in his West Ham attack but warned that he would not be allowed special treatment.
Hernandez, 29, was part of Moyes' Manchester United squad during the 2013-14 season but started just five Premier League games over the course of his reign.
The former Manchester United and Everton manager also told Arnautovic, a £24 million signing from Stoke, that he needed to be "a team player."
"I think everyone knows he [Chicharito] has got a hamstring injury. It could take a week, it could take two weeks."https://t.co/yeOVlPiUbE— West Ham United (@WestHamUtd) November 17, 2017
"I can only go on what people have told me and they didn't think he has come up to the standard he set at Stoke City," the manager said.
"I watched him a lot at Stoke. I thought he looked like the sort of player you would never be keen to play against, if you're a right-back, because of his power and strength and what he can do.
"But he also has to be a team player. The clips I have seen, at times, he has not looked a team player.
"He would not be the only one I would say that about. The other players also have to do the work for the team if they want to be part of it."