The deal can't be signed until Wednesday.

The Mavericks also plan to send an offer sheet Wednesday to Marcin Gortat, a 25-year-old center who backed up Dwight Howard in Orlando last season, according to a person with knowledge of negotiations. The person spoke on condition of anonymity because of NBA rules against commenting on deals before the signing period opens.

Gortat is expected to receive the full midlevel exception of about $5.6 million, which means any more big moves Dallas makes this offseason will come through trades.

The Mavs can dangle the expiring contract of Erick Dampier and the trade-friendly contract of Jerry Stackhouse in front of other teams. Pretty much everyone but Nowitzki could be dealt, too, as the Mavericks explore ways to keep up with the changes made by top rivals in the Western Conference, especially the defending champion Lakers and division foe San Antonio.