A splendid defensive display and then second-half goals from Kevin-Prince Boateng and Sulley Muntari earned Milan a 2-0 win in the first leg at home – but Galliani insists it is far from over.
Tonight’s is a fascinating clash. Barcelona are on a 19-match unbeaten run at Camp Nou in the Champions League, winning 15, since a 2-1 loss to Rubin Kazan in October 2009. They have won 11 of 24 ties in European competition in which they have lost the first leg away from home. However, no team in Champions League history has overturned a 2-0 first-leg defeat.
"We are going up against the strongest team in the world who have a monster like Messi who scores all the time," Galliani said on Milan's official website.
"Let's hope he takes it easy on Tuesday. We can't go into the game thinking we'll be fine just because we've got a two-goal advantage.
"One thing is certain – it will be another great challenge, an infinitely difficult challenge. It's always nice to play Barcelona but we will be going into an incredibly heated atmosphere."
Lionel Messi needs one more goal to overtake Ruud van Nistelrooy’s record of 56, and become the second-highest scorer in Champions League history.
Milan and Barcelona kick off at Camp Nou at 9.45pm (SA time) tonight.