Europehoops.net reports (via the Two Man Game) that Calathes intends to play for the Mavs' summer league team and try to earn a roster spot with the squad that traded for the 45th overall pick in the 2009 draft to select him. At the time, the Mavs considered Calathes a first-round value.
However, a team source indicated that it's far from a sure thing that Calathes will join the Mavs this summer. The source said Calathes is being heavily recruited by several European teams, and the Mavs will be cautious of making even a minimal financial commitment before they've finished their free agency shopping.
Calathes, a 23-year-old combo guard out of Florida, played the last three seasons for Panathinaikos. He'd be a young, inexpensive option who would likely compete with recent first-round picks Rodrigue Beaubois and Dominique Jones for rank on Dallas' developmental pecking order.
The Europehoops.net report also mentions that the Mavs might have interest in Acie Law IV, the former Dallas Kimball and Texas A&M star who became an NBA journeyman after the Hawks took him in the 2007 lottery. Law, who has played for six NBA teams and spent last season in Greece, would likely be fighting for one of the final roster spots if he signs with Mavs.