Man City boss couldn’t explain the 2-1 home defeat to CSKA Moscow that has left his side’s Champions League hopes in doubt.
Manuel Pellegrini’s side were reduced to 10 men in the second half of the clash after Yaya Toure and Fernandinho were both shown red cards at the Etihad Stadium on Wednesday night.
Goals from CSKA forward Seydou Doumbia in the 3rd minute and another in the 34th minute saw the Premier League defending champions crash to a surprise 2-1 defeat.
The Citizens are currently at the bottom of Group E with only two points from their four Champions League matches.
Manchester City they travel to Italy next to play Roma, before a home clash with German giants Bayern Munich [which will be their last match of the group stage] and the City manager was lost for words regarding their form in Europe's elite club competition [Champions League].
"It's very difficult to understand why we played so badly,” Pellegrini told Sky Sports.
"From the beginning we were so nervous. We lost so many passes and we gave them the two goals. Really, we didn't play.
“It’s difficult to know why you have so low a performance. In the way we tried to play we have not changed anything we did in any other games. I realise it’s a very difficult and strange moment to understand why it happened.
"I don't think it's just this competition. I think in the last two weeks we are not playing bad, but we are not playing the way we normally do.
“I don’t understand why, but we must find the reason to arrange the solution.
“The performance of the team depends on individual performances and, I repeat, it’s difficult to understand why we are at this level.”