Mavericks general manager Donnie Nelson won't rule out his father, Don Nelson, coaching again in the NBA.

Nelson, who turned 70 in May, had said that 2010-11 would be his final season before the Warriors relieved him of his duties last week.

"Never say never," Donnie Nelson told FanHouse of his dad possibly returning.

"I thought when he was the godfather (in Dallas after handing the coaching reins to Avery Johnson in March 2005), I thought that was the perfect existence. But he wanted to coach again. With him, you just never know."

With a coaching mark of 1,335-1,063 over 31 seasons, the elder Nelson is the NBA's all-time winningest coach.