Massimiliano Allegri was glad to have Zlatan Ibrahimovic back, but warned Milan's fatigue will show against Juventus on Sunday.
The Rossoneri beat Viktoria Plzen 2-0 at San Siro with Ibra's penalty and Antonio Cassano scored the 2,000th Milan goal in the Silvio Berlusconi era, which began in 1986.
“It is an important victory to give consistency to what we did in Barcelona,” the Coach told Sky Sport Italia.
“We alternated good things with not so good, but overall the win was deserved. Ibrahimovic is an important player and can give great physical presence to the side.”
Ibra had been out of action since before the Barcelona match due to a thigh strain, but played the entire 90 minutes along with an increasingly-tired Cassano.
“When you win, then it helps even physical recovery to speed up. However, for a month we've been playing with the same men and so many games in quick succession. Once again this evening we struggled towards the end with fatigue.
“If Robinho and Alexandre Pato recover for Juventus, then it means I'd have more options, or at least the opportunity to rest someone.
“It is a difficult game on Sunday, even if it's early to talk about it. Juventus have the big advantage of playing only once a week, while we will certainly feel the after-effects of this strain.”
Barcelona conquered BATE Borisov 5-0 in the other Group H tie.