Manuel Pellegrini: "I am concerned because we are losing too many points away and, of course, that's very difficult if you don't win away to try to fight for the Premier League.
"But I don't think we are playing badly, so we must have a reaction, we must improve to make sure we are going to win.
"At the moment, of course, Pantilimon is playing. He hasn't had any problems in the three games he has played.
"The reaction is very similar to the other games that we have lost away. It's incredible the way we lost this match.
"Sunderland played really well also defending. The team is not in a good position, so I understand the way they played.
"But they had just one shot on our goal. We had the possession, we had the chances and we didn't score."
Manchester City Fixtures
Sunday November 24
13:30 Premier League
Manchester City v Tottenham
Wednesday November 27
19:45 Champions League - Group D
Manchester City v Plzen
Sunday December 1
16:10 Premier League
Manchester City v Swansea City
Wednesday December 4
20:00 Premier League
West Brom v Manchester City
Saturday December 7
15:00Premier League
Southampton v Manchester City