The Ghana international played his first match for the Rossoneri last weekend as the San Siro outfit lost 3-1 to Napoli.
"I hadn't played a full match for a long time, but unfortunately the result wasn't positive. We have to keep on playing together and then things will only get better.
"I think that I improved throughout the course of the game. I kept on feeling better as the match progressed and that was important for me.
"The more I play the better it will be. I tried to score but unfortunately it didn't go in.
"This is a very difficult season for Milan, but we have to stay united. We all have to give a little bit extra and help each other out. We are Milan and we have to do better."