Oklahoma Thunder star Russell Westbrook has made significant progress in his recovery from a second surgical procedure on his knee and could return to the Thunder's lineup within two weeks, league sources told Yahoo Sports.

The Thunder issued an original timetable of six to eight weeks from Wednesday's opening night for Westbrook, but barring an unforeseen setback he could be back in the lineup by mid-November.

Westbrook began participating in Thunder practice sessions and has impressed everyone with his explosion and fast return to form, sources said.

After rehabilitating a torn meniscus suffered in the Western Conference playoffs in April, Westbrook spent the summer rehabilitating the injury until a loose stitch caused swelling and forced a second surgical procedure in early October.

Westbrook averaged 23.2 points, 7.4 assists and 5.2 rebounds last season. Before the injury, he hadn't missed a game in his five-year NBA career.