West Ham’s performances and results under Bilic so far this season have been disappointing.
Mazzarri was in charge of Watford for the 2016-17 campaign and kept the Hornets in the Premier League.
The Italian tactician has worked with world-class footballers, such as Edinson Cavani, Marek Hamsik and Ezequiel Lavezzi.
One current West Ham United player, Pedro Obiang, has also worked with Mazzarri. The 25-year-old midfielder was signed by Sampdoria when the 56-year-old was in charge of the Italian club.
Obiang was then just 16 years of age, and last season the former Spain Under-21 international spoke positively of the then Watford match ahead of the two clubs’ Premier League game in February 2017.
"I know Mister Mazzarri well,” Obiang told West Ham’s official website on February 24, 2017. “I met him last summer and he told me he was going to Watford.
“He told me he didn’t speak English, but I told him not to worry because I didn’t speak English when I arrived at West Ham, either!”
“He likes to always play with the same system, 3-5-2, and we arrived sixth in Serie A and reached the Coppa Italia final when he was in Sampdoria, while he also arrived in second place and won the Coppa Italia with Napoli,” added Obiang.
“Tactically he is good, like most Italian managers. He doesn’t like to take a lot of risks, though, so maybe that will be good for us.
“Personality-wise, he was good for us. He didn’t talk to the players too much, because his assistant Nicolo Frustalupi, who is with him always, is a good person who likes to laugh and talk and demonstrate things, like Edin [Terzic] does here at West Ham.”
Obiang joined West Ham from Sampdoria in the summer of 2015 for a transfer fee reported by The London Evening Standard to be worth £4.3 million.