Luiz Felipe Scolari has demanded Chelsea dish out a stiff reality check to European minnows CFR Cluj on Wednesday night.

The Romanian double-winners came from behind to claim a shock 2-1 victory away at Roma on their Champions League debut a fortnight ago and the visit of the Londoners promises to be the biggest night in the club's 101-year history.

As a result, Scolari has been cautioning "respect for a dangerous opponent", and he even went so far as to say it would not be a surprise if Chelsea lost in the three-sided Dr Constantin Radulescu stadium.

But, in reality, unbeaten Chelsea are homing in on a ninth straight victory that would take them a giant step closer to qualifying for the second round of the Champions League.

"We have made a very good start to the season. Cluj are more confident than before because they beat Roma and they have good players - but we know that if we are to reach the second round we need to win," said Scolari.

"When you win games you have more confidence, you are more strong. If we win tomorrow we have one foot in the second round.

"I think it will need 10 points to qualify and if we win tomorrow we will have six points. We would just need four more from four games.

"We want to reach the final and to win the final so it is a very good situation for us."

Scolari though was at pains to point out the qualities of a Cluj side packed with South Americans and Portuguese players, many of whom are familiar to him and have a point to prove.

"The attention of the world is not on Cluj, it is on Chelsea but their players want to change that. They want to show the world they are good players and catch the eye of other clubs," said Scolari.

"They are in this competition because they have good players, they have something different to other teams in Romania.

"They need respect. We win many games in England now because we respect the opposition team.

"Tomorrow is the same. I have shown my players a DVD about Cluj. If they win tomorrow against Chelsea it is because they are better. It is not a surprise."

Cluj coach Maurizio Trombetta believes the shock result at Roma will mean future Champions League opponents will be on guard - starting with Chelsea.

The Italian coach reckons Scolari's side will have taken note of that result, but still knows his side are major underdogs.

"We have nothing to lose," he said. "This is the mentality that I try to instil in my players.

"I am convinced the whole of Europe is watching us and because of that we will have to be very careful. It will be more difficult from now on."

Striker Yssouf Kone agrees with his coach that Wednesday's match will be even more testing than the Stadio Olimpico encounter.

"I think Chelsea are four times stronger than Roma," he said.

"When you play against them, you should run like crazy until the last minute. It can be said that Chelsea are a football machine. (But) in the end, it's 11 against 11.

"The pressure will be on Chelsea, not on us. We have nothing to lose. If they beat us, it would be normal. If we beat them, it would be something fantastic."

Cluj chairman Iuliu Muresan insists his team will be respectful of Chelsea but not fearful.

"We aren't afraid of Chelsea, we respect them," he said. "I am a fan of Chelsea, but not at the game on Wednesday.

"We will try to get point or points in the match with Chelsea to achieve another dream - to finish this group in third place, or even to qualify in the Champions League."

Argentinian Sixto Peralta is back in contention after resuming training following injury.