AC Milan could be without influential midfielder Kaka when they take on Arsenal in the Champions League next week. Kaka was taken off the Rossoneri's 2-1 Serie A win over Palermo on Sunday, complaining from his knee. The Brazilian wizard is set to miss Wednesday's game at Catania as well as the clash with Lazio on Saturday. He is unsure on his availability against the Gunners, in the second leg of the first knock-out stage of the tournament. "It hurts a lot," he told Tele Lombardia. "I hope to be fit for the Champions League match with Arsenal. I definitely won't be there against Catania." The first leg at Emirates Stadium ended in a goalless draw as European champions Milan aim for a second successive title.