"For most of the time we were in the lead, we controlled the game, we created more chances than them," said Skrtel.
"Petr Cech did perfectly for Chelsea and we, instead of winning 3-0, managed to claim just a 1-1 draw.
"Everything is still open, there are 90 minutes to be played. They are up now but I firmly believe that we have the potential to score a goal at Stamford Bridge.
"And if we don't concede, we will go through - the mathematics are as simple as that. I am convinced it will turn out well for us in the end."