The Stamford Bridge club were put to the sword at San Paolo in the first leg, and host Walter Mazzarri’s men in the return fixture on Wednesday.
Although Andre Villas Boas has been sacked and there is a deficit to overturn, the Spain international still maintains that the English team can qualify for the quarter finals.
“In football, nothing is impossible,” the 23-year-old said in a press conference, published on Sky Sports.
“At Stamford Bridge, this Champions League, we had good results in the group – 3-0, 2-0 and 5-0.
“All the supporters, for sure, will be cheering us. It’s a final for us and I think we can do it. From the first minute, we have to try to create chances to score.
“We know that they have very, very good strikers. We have to be careful with them but we are going to press them from the first minute,” he continued.
Mata went on to admit that the change in management has been difficult, but that recent domestic wins will see them enter Wednesday’s game with confidence.
“It wasn’t easy, because you know we had a change, a big, big change.
“But I believe the team is still believing, is still working very well and the two wins, for sure, bring to us a lot of confidence,” he confessed.
By Gareth McKnight