This is a remarkably easy answer. Juventus are definitely more likely to advance in Champions League than fellow Italian club AC Milan.
The reason is Barcelona.
Not only is Lionel Messi probably the best player in the world—he broke the record for goals scored in a calendar year in 2012—he also plays on one of the most cohesive clubs you’ll see. Five of the FIFA World XI for 2012 are Barcelona players.
There's just no way anyone could argue Celtic is a tougher draw than Barcelona.
Forget the fact that Milan are without Balotelli's services for the duration of their time in the tournament. He has three goals in two games in Serie A so far, but even if they had Balotelli, the likelihood of Milan being able to overcome Barcelona would be minimal at best.
Couple that with the fact that Barcelona has only lost three games across all competitions this year, and it looks like a predictable result is on its way for the Barcelona vs. AC Milan.
On top of that, Juventus have proven themselves a better club than AC Milan all season.
Celtic will give Juventus all they can handle, and there's certainly no guarantee that Juve will put them out of the tournament. Celtic have been nothing but dominant in the Scottish Premier League this season, and they have been strong across the other competitions as well.
Juventus have had their setbacks this season, but they've remained consistently strong.
AC Milan have been inconsistent at best. Their lower placing in the Serie A table is mostly due to their slow start, but only a team in top form, with everything working together for them would have a chance to eliminate Barcelona—especially this early in the tournament.
Is there a chance Milan can top Barcelona? Make your case in the comments below.