Manuel Pellegrini refused to be drawn into speculation regarding his future at Manchester City following Sunday's 4-2 loss to Manchester United.
The result, City's fifth league defeat in 2015, leaves the reigning Premier League champions four points adrift of third-placed United with all hopes of retaining their title all but extinguished.
Pellegrini recently bemoaned the sacking culture in England's top flight, insisting he was not concerned over his position but was less forthcoming following their second defeat in six days.
"I'm not talking about my position," Pellegrini bluntly replied to questions after the game.
Sergio Aguero gave City the lead after just eight minutes, only for United to roar back through Ashley Young, Marouane Fellaini, Juan Mata and Chris Smalling before the Argentine added a late consolation.
Pellegrini added: "I think it was a clear result for Manchester United. We started very well in the first 20 minutes. After that I think they started playing better than us.
"They started playing with a lot of class and were clear winners. We didn’t defend well, particularly for the goals. We lost many points, not only in this game. We must play not for 20 minutes but the whole game."
He continued: "Maybe [squad spirit] is something we can be concerned about. I think we made important mistakes for the second goal and maybe the third goal was offside.
"They played better than us but it’s more easy to play when you are two goals ahead. We must try to continue playing the same way we did in the first 20 minutes."
Next up City is West Ham as they look to hold off the likes of Liverpool, Southampton and Tottenham to secure a place in next year's Champions League in the final six games of the season.
"We are concerned to try to win the next game," he said. "We have six more games to play. We have lost twice in the last week but we have 18 points to play.
"We must not make dramatics in this moment. We must try to recover as soon as possible from this defeat. It was a bad 2015 and a very bad week but we must all try together.
"We will work on the minds of the players this week. We must improve. If we win a game, we will recover."
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