"Physically we are there now, we are exactly where we want to be. That is not at 100 percent, but we will not have that until September or October probably.
"We won one competition last year, that's all. This team is built for being successful and that is what we try to do. Tomorrow night is another chance for us."
He added: "If people really think that Chelsea is not a real challenge then I can't help these people.
"They are really strong and young and fresh, and everything is exciting in the moment because Frank is there, new, the club legend.
"It will be really interesting, and for us it's a really important game."
Liverpool have won the Super Cup on three previous occasions, most recently in 2005 when they defeated CSKA Moscow fresh from coming back from three goals down to beat AC Milan on penalties and win the Champions League in Istanbul.
Defender Dejan Lovren is out due to illness for the Reds, while Naby Keita is a concern after coming off the pitch during training on Tuesday evening at the Vodafone Park, home of Turkish Super Lig side Besiktas.
Meanwhile, recent signing Adrian will start in goal in the absence of Alisson Becker, who is set to miss several weeks with a calf injury.
"This is his second week, since then we've been working day in, day out, and I think for him it is obviously very good that he starts playing straight away," said defender Virgil van Dijk of the Spanish shot-stopper.
"It obviously is not the situation that you hope to be in, that Alisson is getting injured and you have to come in, but he is experienced enough to go out there and show his qualities."