The Rossoneri put on a sensational second half display with Zlatan Ibrahimovic, Alexandre Pato and Kevin-Prince Boateng getting amongst the goals.
"What I saw seemed like the Milan of 20 years ago," Galliani said. "It was a fundamental game. We knew that.
"Marek Jankulovski was a big surprise. He did more than an hour very well. He played great after being out for a long time.
"I liked Mark Van Bommel a lot.
"We have stretched the table wonderfully. We are top of the League with a five-point gap on second place.
"Up until this point we had a three-point advantage on second place. Now we have five.
"We have been top for many months. Now there are 11 games in front of us."