The 32-year-old had been without a club since his release from Fulham earlier in the summer but Sam Allardyce has moved to sign him after Andy Carroll's latest injuryWest Ham have signed Croatia striker Mladen Petric on a free transfer.
The 32-year-old had been without a club since his release from Fulham earlier in the summer but has joined the Hammers on a deal until the end of the season.
Hammers boss Sam Allardyce was close to re-signing Carlton Cole but failed to complete a deal and has instead opted to add Petric as he looks to bolster his attacking options, with star forward Andy Carroll suffering an injury setback on Monday.
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"I know [the Premier League] and I'm happy to be back in the Premier League because it's a fantastic league and I'm really looking forward to being part of this team and this club.
"There are a lot of good players here and I'm happy to be part of such a good team and I hope we can all celebrate my first goal for West Ham as soon as possible.
"I didn't speak to Sam [Allardyce] until [Tuesday] but I've heard a lot about him and I spoke to Guy Demel, who I know from my time at Hamburg, and I'm sure I'll have a good time here.
"I remember playing at West Ham last year and it was a very tough game for us at Fulham. I think we lost 3-0! It's not easy to come here and take points away."
Petric has previously played for Bundesliga sides Borussia Dortmund and Hamburg and netted five goals in 10 starts for Fulham.