Dallas president of basketball operations Donnie Nelson often says that the NBA personnel game is a 365-day-a-year gig, but the major work is done this offseason for the Dallas Mavericks.

The Mavs managed to make major upgrades at center and small forward by trading for Tyson Chandler and signing restricted free agent Chandler Parsons. Those two transactions, along with re-signing Dirk Nowitzki and Devin Harris, make this a successful summer for the Mavs.

But Dallas isn’t done yet. The Mavs still must fill out the roster, most importantly finding a sixth man to replace Vince Carter.

The Mavs still have their cap-room exception of $2.73 million, which will likely be offered to guard Mo Williams. They also have two minimum-salary slots, one of which is likely to go to center Bernard James, a source said. The Mavs could also need a backup power forward -- perhaps summer leaguer Ivan Johnson -- but Brandan Wright is expected to get significantly more playing time at that position next season.

The contracts for Nowitzki, Harris and minimum-salaried veteran swingman Richard Jefferson, and trade for center Greg Smith, are not yet official, but those are mere formalities. A look at the Mavs’ roster:

PG: Raymond Felton, Harris, Gal Mekel

SG: Monta Ellis, Ricky Ledo

SF: Parsons, Jae Crowder, Jefferson

PF: Nowitzki

C: Chandler, Wright, Smith