He missed four games last season because of torn cartilage in his left knee .
The Bulls are trying to get younger and more athletic , though Valentine is not as athletic as others in the draft and is more of a hard - working leader .
Valentine missed four games last season because of torn cartilage in Valentine 's left knee .
The Bulls are trying to get younger and more athletic , though Valentine is not as athletic as others in the draft and is more of a hard - working leader .