The Argentine attacker has also revealed that Manchester City star Sergio Aguero is one of the best strikers he has ever played with.
MZ: I love Old Trafford. It's a beautiful stadium, it's massive and it's really nice to play there #AskMauro— West Ham United FC (@whufc_official) October 15, 2015
Zarate joined West Ham from Velez Sarsfield in the summer of 2014, but he did not make an immediate impact at the Boleyn Ground.
The 28-year-old scored two goals and created seven chances in seven Premier League appearances for the Hammers last season before being sent out on loan to Queens Park Rangers in the January transfer window.
The former Lazio star could not do well at Loftus Road either, appearing in just four league games as QPR suffered relegation to the Championship at the end of the season.
Zarate has been playing better this campaign despite his injury problems, scoring one goal and creating five chances in four Premier League matches.