Derrick Rose is not sure when he will be ready to return from his groin injury, which he is blaming himself for in terms of the severity.

‘‘In the New York [game], when I went to the hole, I took off kind of wrong and Jeremy [Lin] beat my shot,’’ Rose said. ‘‘I thought I was going to take off, but I couldn’t get up that high. I just felt the pull. I thought it was like a charley horse or something. When I went down, I tried to stretch out, but there was pain there. Usually, when you have a charley horse, it’s just tight. There was pain, but I wanted to play through it. I played through it, but I think it made it worse.”