Inter Milan coach Simone Inzaghi insists they didn't deserve their 3-2 defeat to AC Milan.
Rafael Leao scored twice and Edin Dzeko allowed Inter to leave it open to the last second, with Milan goalkeeper Mike Maignan denying superbly Hakan Calhanoglu.
"It started a balanced game, then we scored a fine goal, after the equaliser we had a half-hour black-out that cost us another two goals," Inzaghi told DAZN.
“We scored two wonderful goals, but conceded three that we absolutely cannot afford, we should not concede, especially not in a derby. At the end we lost.
“Considering everything we created, we probably deserved a draw, but I am the coach and the first to be held responsible for that half-hour that left to be desired. In such an important match, we should've done better."
It is the second defeat of the season after the 3-1 away to Lazio.
“They were two different games. We struggled to score tonight, were up against a fantastic goalkeeper, and once again we concede goals far too easily. I am the coach, so I need to figure out how we can resolve that problem.
“In order to win the derby, you have to do more. After the substitutions we did better, but the fact is during that half-hour we conceded two goals and were unable to make up for it."
He added: “We cannot have these blackouts against sides like Lazio and Milan, as they compromise the match. Details make the difference, we had to build our chances out from the back, whereas the goals we conceded were just too easy.
“There was that moment when we were in control and leading 1-0, but we conceded that goal when playing out from the back and it was totally against the run of play."
