Mancini, on his 46th birthday, claimed his side, who went ahead through Micah Richards in the 81st minute, deserved to win.
The Italian said: "The season is very long. Every game for every team is difficult.
"This was a good test for us on a difficult pitch.
"I am disappointed with the result because we deserved to win. It was a fantastic performance in the second half.
"Richards scored a good goal, he was not 100% but played well and I am happy for him."
Source: PA
Source: PA