Dallas will be the fifth team in five seasons for Marjanovic, who started his NBA career with the rival San Antonio Spurs in 2015-16. The 30-year-old went to the second round of the Eastern Conference playoffs with Philadelphia last season. He has career averages of 6.2 points and 3.9 rebounds.
The probable starter at center is Dwight Powell, who opted in for the final year of his contract and then agreed to a three-year extension. The addition of Marjanovic comes after the Mavericks agreed to deals with three of their own players, two of them restricted free agents in Germany's Maxi Kleber and Dorian Finney-Smith.
Point guard J.J. Barea, the only player remaining from Dallas' 2011 championship team now that Dirk Nowitzki has retired, is returning while still recovering after tearing an Achilles tendon last season.
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