The Bluesâ€™ boss also said his team had done enough not only to have earned a point after a magnificent second-half fight-back, but perhaps should have gone on and won the game in the time that remained.
â€śItâ€™s very hard to lose a derby, but even more so in the last minute so Iâ€™m very disappointed,â€ť said Mancini. "We dominated the second-half and for this reason, I am really disappointed.
â€śThey scored from their first two goal-scoring opportunities but after that, we dominated the game and fought back really well, but we canâ€™t then give a goal away after working so hard.
â€śI think we made a mistake for the Van Persie free-kick at the end by only putting three men in the wall. I wanted four but I couldnâ€™t get the instruction over and I think that cost us the goal.
â€śWe should have defended this free-kick better and we had chances to win this game, but there is nothing we can do about it now.â€ť