Chelsea boss Carlo Ancelotti admits he's not 100 per cent sure about Spartak Moscow's plastic pitch.
The Italian refused to name his team until the players had trained on it.
"I can say nothing about this because we haven't tried this kind of pitch," he said.
"We want to try it this evening in the training session and after that we can have an opinion about this.
"We don't have a problem to play here, I hope, but it is different, it is one of the best artificial pitches. We don't complain about this."
Defender Alex, striker Didier Drogba, right-back Jose Bosingwa and England midfielder Frank Lampard have all been left behind at the club's Cobham training headquarters.
"I can't give the line-up because we want to try the pitch before," Ancelotti said.
"If the players are comfortable to play there I will take the decision after the training session.
"We don't have important players, but we are able to play a good, physical match and I don't think we have a problem with a reaction from the game against Aston Villa. We'll put out a very good line-up tomorrow."
