AC Milan are set to miss key midfielder Clarence Seedorf when they clash with Premiership leaders Arsenal in the Champions League on Tuesday. The Dutch veteran limped off Saturday's 1-1 draw with Lazio, complaining from his thigh, and coach Carlo Ancelotti does not seem optimistic about his chances to face Arsenal. "We'll see over the next few days, but I think it will be difficult to have him back for Tuesday," the Milan coach told Sky television. Ancelotti is consternated that his injury-hit side could find life difficult when facing the young Gunners at San Siro. Besides Seedorf, talismanic playmaker Kaka missed the previous two games and his availability is yet to be confirmed, while striker Ronaldo is out for the season with a knee injury. "I am only worried by the fact we are going into a match with a very strong team in what is not our best form," he added. "We're tired but so are all the other teams, even in Europe, I don't see teams producing spectacular soccer."