ClaretandHugh was the first media outlet to report the likely move earlier today but tonight the mood turned bitter as Zarate slammed Sam Allardyce’s treatment of him.
He accused the Hammers boss of refusing to play him because he was signed by chairman David Sullivan.
Zarate will undergo a medical on Tuesday and said: “I now have the chance to play for a coach who has faith in me and will not allow his personal feelings to get in the way of what is good for the team.
Talking to The Mirror he added: “I respect the other strikers at the club who have done a good job. But I believe my record entitles me to respect and I have not had that from the manager.
“The chairman has confidence in me. I know this because he brought me to the club. But for this reason the manager has refused to play me. He did not want me.”
He added: “I made it clear many weeks ago that I wanted to leave.