Zarate moved to the Hammers from Argentine club Velez Sarsfield in the summer transfer window on a three-year contract.
This is the second spell in England for the Argentine, who first played in English football back in 2008 when he turned out for Birmingham City on loan from Al-Sadd.
Zarate is happy to have joined Premier League outfit West Ham and is enjoying himself with his new teammates, but he admits that initially he struggled with the accents of Englishman Cresswell and Irishman O’Brien.
“We have a fantastic group of players here,” the 27-year-old wrote on West Ham’s official website. “I knew they were talented before I came but I didn't know their personalities.
“Everyone here is very welcoming, the players, the coaches, everyone. Kevin Nolan is a very funny guy, a lot of the lads make me laugh.
“At first I couldn't understand what Joey O'Brien or Aaron Creswell were saying because their accents are so strong!
"When I first arrived it was very helpful that Enner, Adrian and Diego all speak Spanish but my English is improving all the time.”
Zarate’s return to the Premier League has not gone according to plan, though, as he has yet to show the form he exhibited for Birmingham back in 2008.
Injuries and competition for places seem to have impeded the former Lazio star’s progress at West Ham so far, but there have been signs that the forward could play an important role for Sam Allardyce’s team as the season progresses.
In five Premier League appearances, Karate has scored two goals and has created six chances, while having a 85% pass accuracy and a 100% shot accuracy.