While the Los Angeles Lakers were in Toronto on Sunday finishing off their six-game road trip, Lakers general manager Mitch Kupchak was holding a private workout for free agent guard Gilbert Arenas, according to multiple sources.

Arenas, who turned 30 last month, looked "slimmed down" and "explosive," according to a source with knowledge of the workout, but no signing is necessarily imminent as the guard flew back to his home in Orlando, Fla., from Los Angeles on Sunday night.

Arenas recently underwent a similar blood-spinning procedure on both of his knees and hips that Lakers guard Kobe Bryant visited Germany during the offseason to receive. Arenas was treated by Dr. Edward Capla in New York City. Capla used to work under Dr. Peter Wehling, who treated Bryant and New York Yankees slugger Alex Rodriguez. After Arenas reported the procedure made his left knee, which had undergone three operations since 2006, feel springy again, he recommended Capla to former teammate and New Jersey Nets guard DeShawn Stevenson, who also received the treatment.