The France international made the move to east London from Marseille in the summer but he has managed just one Premier League start in claret and blue.
He says an agent involved in the transfer ‘promised him the moon’ and says those promises have been unfulfilled so far.
"I wish I had talked to him [Sam Allardyce] before signing, but the speeches of the [West Ham] leaders were very positive," he told L’Equipe.
"I was told that I would be the manager’s priority. Moreover, the transfer happened very quickly.
"At thirty one years old, I wanted to find another league [to play in]. Marseille needed to reduce their wage bill, so it suited everyone. West Ham came to get me.
"They appointed an agent who told me of the challenge that would await and promised me the moon. The speech was attractive - it was in London, in England, with West Ham, a popular club. I was an opportunity to establish myself in the Premier League.
"After a few weeks I realised that there were a lot of lies. This agent has fooled me. Some have made money on the back [of my transfer]. Admittedly I have a three-year contract - I’m not unhappy financially - but I came to play, not to have an early retirement."