Former Chelsea defender David Luiz says Paris Saint-Germain are capable of causing an upset when they take on the Blues in the Last 16 of the Champions League.
The 27-year-old joined Chelsea in the 2011 winter transfer window and made 143 appearances for the club.
He joined the French giants in a deal worth in the region of £40m and on Tuesday he will come face to face against his old team-mates.
"If we concentrate we can do it," Luiz is quoted as saying by the Daily Star.
"You breathe it every day. You imagine a final and lifting the [Champions League] trophy.
"You put all that into practice. The daily dedication every second of your training and in matches during a year. You give up many things for that goal.
"Today I'm part of a team that has a lot of possession.
"We love to control the match but we've already learned that in the future we will face opponents that will have more possession than us and we will have to adapt.
"You never face opponents with the same game plan, with the same quality, so you need to be able to adapt a lot."
