The Swede scored his second in as many games and was at full stretch to volley in the only goal of the game, defeating Genoa 1-0 earlier this evening.
"I am tired, but one has to make sacrifices in order to win," he said.
"It was an important game and everyone worked so hard. Now is one of those times when even the easiest things become difficult, but the important thing is to win.
"This Milan does not just depend on one player. We are 11 on the field, five on the bench and another five who aren't in the squad right now," continued Ibra.
"It depends on everyone, as we all work together and go forward. If we all work and are concentrated, then I am not worried.
"In the last few games we were unlucky, but it went well today. If we carry on like this, then Milan can go top of the table.
"We mustn't focus on what other teams are doing. If we do our job, we'll end up on top."