Despite trailing 2-1 from the first leg, the Swiss side's manager is confident his players will be competitive during Thursday's Europa League semi-final second leg
The Swiss outfit trail the European champions 2-1 from the first leg at St Jakob-Park and have never won in England in nine previous attempts, while the Blues are unbeaten at Stamford Bridge in Europe since 2011.
But Yakin has confidence in his players after impressive displays against the likes of Tottenham and Zenit St. Petersburg in previous rounds.
"Every game is difficult and we know we're playing against Chelsea, who are the Champions League winners. They have two top players in every position," Yakin told reporters.
"But we will do everything. We will be brave, we'll play with confidence and who knows? Maybe we can achieve a small wonder and we can qualify for the final.
"I don't hold much for statistics. What I want is that we play here, we play very good football and that we start well.
"Chelsea are defensively very good, they are very good in attack, but our team also has very good qualities. We have shown that against Tottenham, what we're capable of doing.
"We're very happy to be here. We will be trying everything to get to the final. We will fight hard, we will give passion. We know it's difficult - we've got a 2-1 deficit to catch up. We have to see what we can do, be confident and try our best."
Real Madrid boss Jose Mourinho has been strongly linked with a move back to Chelsea in recent weeks - with Goal.com revealing that deals for the Portuguese and Radamel Falcao have been agreed - and Yakin hopes such speculation may distract Rafael Benitez’s players.
"Maybe that's good for us," Yakin said. "We know what we have to do, we know what we have to do to qualify. We have one goal, we'll give our best."