AC Milan coach Massimiliano Allegri says his side cannot afford to repeat the slow start they made against Lazio when they tackle Barcelona at the Nou Camp in the Champions League on Tuesday.
Milan began their Serie A campaign with a 2-2 draw at home to Lazio on Friday where they paid for an uninspired opening by trailing 2-0 inside the first 20 minutes.
"We need to be careful and to avoid playing like we did in the first 20 minutes against Lazio," said Allegri before his team's departure from Milan on Monday.
"We need to be very careful and show great respect to Barcelona while trying to do well in both defence and attack."
"We're playing the team who at the moment play the best football but we have great players, we're Milan and in football you can't bank on anything."
"I'm not emotional, I'm just thinking about the game which is only the first in the group stages and not a final."
"I want us to tackle it with serenity and to qualify for the knock-out stages."
Allegri also revealed he will make changes to the team that played Lazio, with no space for Italy forward Antonio Cassano.
"Cassano played very well against Lazio but tomorrow (Tuesday), due to his characteristics, Pato will probably start alongside (Zlatan) Ibrahimovic in attack."
Allegri also had a kind word for his Inter Milan counterpart Gian Piero Gasperini, who began his nerazzurri reign on Sunday with a 4-3 defeat at Palermo.
"Palermo-Inter was a great game, it was intense and exciting but you can't kick out all the hard work Gasperini's been doing because of one defeat," he said.