News of the deal was first tweeted by Wizards point guard John Wall.
Gortat agreed to a five-year deal worth a fully guaranteed $60 million, with neither a player nor a team option entering the final season.
The deal can't officially be signed until July 10 when the league moratorium is lifted.
But Wall broke the news of the agreement:
- John Wall (@John_Wall) July 2, 2014
Gortat also took to Twitter on Tuesday night.
I'm proud to say Washington will be my home.
- Marcin Gortat (@MGortat) July 2, 2014
The 30-year-old Gortat averaged 13.2 points and 9.5 rebounds per game last season, his first with the Wizards.