Lost beneath the latest update on Andrew Bynum on Tuesday, Sixers head coach Doug Collins said he doesn’t believe injured forward Thad Young will be able to return in time for Sunday’s game against the Knicks at Madison Square Garden. Out since Feb. 4 with a Grade I hamstring strain, Young was expected to miss at least three weeks. However, after responding to treatment and going through some drills with the team during Monday’s practice, Collins thought Sunday could be the earliest Young would return. But after Tuesday’s practice, Collins changed his tune a little bit. “He jogged a little bit and picked it up a little bit, so that was encouraging,” Collins said. “I’m hoping he continues on that path. I know [athletic trainer Kevin Johnson] talked about New York, but I think it would be much more likely for Orlando [on Feb. 26]. I think it will be three weeks this weekend.” Without Young, the Sixers are 1-3 with losses in their last two games. Richardson has successful surgery Veteran guard Jason Richardson underwent surgery on Tuesday to repair a quarter-sized hole in the cartilage behind his left knee in New York City. The procedure was performed by orthopedist Dr. Jonathan Glashow at the Mt. Sinai Medical Center. According to the Sixers, Glashow “repaired an articular cartilage lesion on the medial femoral condyle.” Richardson will need 9 to 12 months of recovery from the surgery.