Petrovic admits he's close to teammate Cole Palmer.
"Cole is an amazing guy, always relaxed... maybe even more on the pitch than off it," Petrovic told the club's website. "He has had an amazing season and helped the team a lot.
"Sometimes we have lunch together and I have beetroot a lot, most times. So, Cole gave me the nickname Beetroot. I needed one for him and he eats a lot of beans, which I think is normal for English people, so he is now Beans.
"I know people call him Cold Palmer, which is a correct nickname for him, but for me he is Beans."
He continued: "We have built a good chemistry.
"But that is the same for all the players. A lot of us were in our first season so we developed and improved together as a group.
"Everything has happened very quickly for me. I have very much enjoyed it and in my first season – not that I didn’t believe in myself or my level – playing so many games wasn't really expected. But I tried to improve every day and help my teammates."