Galatasaray manager Roberto Mancini has admitted that Chelsea have a "small advantage" in their Champions League last-16 tie.

The two sides will go head to head in the second leg at Stamford Bridge tomorrow night, having played out a 1-1 draw in the first leg in Turkey last month.

That result means that the visitors will have to score at least once if they are to progress through to the last eight, and Mancini is hoping for a repeat of the form that saw them progress from Group B ahead of Italian champions Juventus.

"We did a miracle in the group because it was really difficult to go through in that group," Mancini told reporters.

"Chelsea have a small advantage. I don't know if it will be enough to score one goal. Tomorrow we will see what happens."

The match will also see Chelsea legend Didier Drogba return to Stamford Bridge for the first time since leaving the club, and the Ivorian has admitted that he will find it "difficult" to face his former employers.