Barcelona welcome back Deco for the second leg of their semi-final after he missed the first through suspension.
The Catalans will be without Argentine forward Lionel Messi and full-back Oleguer who are injured, while Henrik Larsson is a doubt with a thigh strain.
AC Milan are missing midfielder Massimo Ambrosini who suffered a fibula fracture in his left leg on Saturday.
Kaka and Alessandro Nesta were injured in the same game and are doubtful but Filippo Inzaghi is expected to be fit.
Barcelona midfielder
Deco is expecting a tough battle and said: "They will be going full out because they know they have to win and they will be on the attack and pressuring us all the time.
"We can`t allow them to have as many chances as they had at the San Siro."
Milan vice president Adriano Galliani believes his side can overcome the 1-0 deficit to book a place in the Champions League final.
He said: "Milan can win at Camp Nou, although we are aware of the strength of Frank Rijkaard`s team. It will be a great match."
