The 7-foot Withey averaged 2.9 points and 2.4 rebounds in 51 games last season. He made one start. He has career averages of 3.3 points and 2.6 rebounds in four seasons with New Orleans and Utah.
The Mavericks still haven’t signed restricted free-agent center Nerlens Noel to a long-term deal. He has a qualifying offer and is expected to remain with Dallas after the Mavericks acquired him at the trading deadline last season.