Wesley Matthews will definitely not be ready for the Dallas Mavericks' regular season opener.

Matthews is still returning from a torn Achilles sustained on March 5th.

Asked if Christmas was a realistic date for Matthews' return, Rick Carlisle said: "It's a definite maybe.

"It could be sooner. It's hard to say. His court activity has been ramped up some. He will participate in certain aspects of training camp, but nothing live to start with."