AC Milan coach Carlo Ancelotti is wary of the challenge his team face in the Champions League knock-out round against Celtic.
'Celtic are a very good side,' said Ancelotti.
'They beat Manchester United and they are a team to fear.'
The only consolation for Ancelotti, is that the Rossoneri will play the crucial second leg at home.
'Considering the atmosphere that we will face in Glasgow, it will be an advantage to play the decider at the San Siro,' he said.
Ancelotti has warned Celtic not to underestimate them despite their inconsistent form they have showed in the domestic front.
Fifteen games into the season, Milan are in 15th position in the Serie A standings, three points clear of the drop zone.
The Rossoneri have been plagued by injuries this season but should recover most of their players, including goalkeeper Nelson Dida and defender Alessandro Nesta, in time for the clash against Celtic.
'For us, this break before the knock-out round will be crucial,' said Ancelotti.
'We will see a different Milan on February. We will recover our top players and for us this break before the knock-out round is crucial.'