The new West Ham boss has been discussing the famous ground.
Indeed, the Croat says the Boleyn Ground is 'definitely' bigger but admits memories of playing for West Ham many years ago have come flooding back.
Bilic remembers the 'roar' and atmosphere and will be looking for more of the same from the Hammers faithful ahead of next term.
The 46-year-old was announced as Sam Allardyce's successor with the east London club earlier this week and was discussing his thoughts about Upton Park.
He said: "I was expected this kind of feeling but when I entered the pitch, all the emotions started to come back. The Chairman asked me if it looked the same but it has been nearly 20 years and it has changed a bit and is definitely bigger!
"The atmosphere around the whole stadium came flooding back to me and it felt like it did 17 or 18 years back. I can still remember the roar and the atmosphere and the good feeling to be in this stadium."
Of course, next season will be West Ham's last at Upton Park before a move to the Olympic Stadium, where the club's fans will no doubt hope more memories can be created.
Making their final campaign at the Boleyn Ground a memorable one is quite a responsibility for Bilic, although he will be aided by new signings and European football.
Bilic has also revealed he was linked with the West Ham post in 2008 and 2010 but considered the Croatia job too 'special' of an opportunity to leave.