The Blues must score at the Nou Camp to advance after the first leg in London ended in a 1-1 draw.
It won't be an impossible task for Chelsea, but given the Italian's inclination to play defensive football, Gullit believes the pressure is on Conte to show he can mastermind a memorable victory.
"He's going to show us if he has the right tactics, if he has the right changes.
"Look at Tottenham, look at what Juventus did – one change, two changes and the whole game changes.
"That's what you expect from a coach and you need to do that. That's fantastic to see. And if you don't see that at the right moment, then you get criticised."