"I think that we played a good game. To win the game we had a lot of chances, but it was a difficult match because we were 1-0 down. I'm very pleased with this," Mancini told BBC Sport.
"I was worried because we continued to play well and continued to create chances, but didn't score [until] 87 minutes. I was pleased for Edin to score such an important goal."
The triumph against the Cottagers ended a four-game winless streak for the Blues in all competitions.