The Mavericks expect Dirk Nowitzki to opt out of the final year of his contract, a source said Saturday, because it will allow the two sides to work on a new four-year deal.

If Nowitzki opts out by July 1, it may allow him to add a no-trade clause to any new contract.

The source added that whether he opts out or not won't have any impact on the likelihood that Nowitzki will remain with Dallas.

Working out a new deal could give the Mavericks more flexibility in the next few seasons.