Nelson says Carlisle's job is safe

DALLAS -- Mavericks president of basketball operations Donnie Nelson said coach Rick Carlisle will return as head coach next season.

"There's nothing coming out of the blue," Nelson said.

Nelson said he and owner Mark Cuban are already working to upgrade the roster.

"We'll be as active as we've ever been," Nelson said. "We certainly don't think that we have arrived as a product. The results pretty much dictate that.