By ESPNSTAR.com staff
Pato, 23, left Milan to join Corinthians recently and the forward, often heralded as one of the world's best young strikers, will be fondly missed by the fans. Joining Milan as an 18-year-old in 2007, he scored 51 Serie A goals during his time at the club but continual spells on the sidelines as well as nostalgia got the better of him and he sought a return to his homeland.
Against Siena, however, two of the club's lesser lights in Giampaolo Pazzini and Bojan rose to the fore and scored two second-half goals to secure the win.
Galliani pointed to the Spaniard's performance as evidence that Milan don't really need to bring in reinforcements in the January transfer window.
"I think that Bojan is a very important part of this team and his entry today [Sunday] changed the game completely," he told acmilan.com.
"I paid my compliments to him and I told him as much when I congratulated him on his performance.
"You could see as soon as we took to the pitch in the second half, we were a different team. You could see that whatever the coach said at half time had a big effect and then Bojan changed the game for us.
"The whole team though came on for the second half with a completely different approach and you could see that from the first minute.
"There are regrets over Pato, as he had two stratospheric seasons without injury and was also decisive in the 2011 Scudetto.
"[But] the lad wanted to go back to Brazil and joined the side that won the Club World Cup."
Galliani also confirmed that Robinho would stay on at the club as the striker could not reach an agreement with Santos.
"Robinho did not want to leave Milan, he just wanted to go home," explained Galliani.
"We failed to agree a deal with Santos and his agent couldn't agree personal terms either.
"Other Brazilian clubs were ready to fulfil all the requirements, but Robinho wanted to stay with Milan. I heard from Gremio yesterday and they wanted him at all costs.
"With Pato there were six strikers, while now we have five and they are enough. If nobody else leaves, then nobody will come in during the January window."
However, coach Massimiliano Allegri did specify that there were too many fringe players at the club and therefore it is likely that there would be further departures.
"I'll talk to Adriano Galliani tomorrow [Monday] afternoon about transfer activity. 31 players is a lot and we can't constantly leave out eight players.
"If some of them want to leave to play elsewhere, it's understandable."