There is plenty of speculation surrounding the Rossoneri boss after his side slumped to 15th on the Serie A table following the weekend's loss to Lazio with suggestions he could be on his way out if there is a negative result in Spain in the Champions League.
But Galliani has made it clear that Allegri will continue in the role regardless of the outcome at La Rosaleda.
"It won't be Allegri's last night," said Galliani. "The club's fortunes are made by the club, the coach and the players, and I have never sought to divide the three.
"This is the way we have put Milan at the top over the last 26 years.
"This is not the moment when results arrive, but let's hope they will arrive from this evening.