Mateja Kezman today insisted Fenerbahce have got his former Chelsea team-mates running scared and believes they will knock Avram Grant's side out of the Champions League.

Kezman is set to play against Chelsea tomorrow night in Istanbul for the first time since he left Stamford Bridge in 2005 and is confident he can help his Turkish club cause a shock.

The 28-year-old, who scored just seven goals in his one season at Chelsea after joining from PSV Eindhoven for £5million, has scored 10 goals to help Fenerbahce climb to the top of the league in Turkey this season.

They have a 100 per cent record at home in the Champions League having beaten Sevilla, Inter Milan, PSV Eindhoven and CSKA Moscow.

Kezman has already been in contact with some of his former team-mates and said: "When I spoke to my old friends in the Chelsea team I could tell they were scared of playing in Istanbul.

"We are happy to be playing Chelsea and we are not the ones under pressure. This will give us the power in the tie and help us go through.

"I don't have to prove anything to anyone. The Chelsea fans respected the way I played football. They saw that I am a fighter and it will be tough for me to see them again and play against them.

"I am wondering how our fans will react because when we beat Sevilla there were 100,000 people in Istanbul, but Chelsea will be even bigger."

Kezman feels his side will have the upper hand now that Avram Grant and not Jose Mourinho, the man who signed him for Chelsea, is in the opposing dug-out.

The Serbian international claims Grant has ruined the team spirit that the Portuguese built and added: "When Mourinho was there, Chelsea was like a machine. Everything ran like clockwork. Now, talking to old friends at the club, I understand it's not so good.

"There are rows on the training pitch, the kind of problems that never would have happened when Mourinho was in charge."