With Madrid still locked in a tight battle with Barcelona for the Primera Division crown, the Brazilian playmaker has conceded he could have played better this season, but blamed injuries for his failure to settle into the side.
"I'm not happy with my performance, but my problem is physical," he said. "I have suffered a lot since I arrived."
Kaka denied sustaining his troublesome thigh problem in that match, saying it happened in training subsequently.
"I was not hurt in the game," he said. "It was the following Saturday when I hit the ball I felt pain."