Adrian Wojnarowski of ESPN reported Irving is "thrilled" to join the Celtics, and the team will have a "great chance" to re-sign him.
The Celtics agreed to send Isaiah Thomas, Jae Crowder, Ante Zizic and the Brooklyn Nets' 2018 first-round pick to Cleveland in exchange for Irving. A four-time All-Star, Irving reportedly requested a trade from the Cavaliers in July, citing his desire for a more prominent role and to no longer play with LeBron James.
Irving is under contract for the next two seasons and has a player option for 2019-20. It's highly likely Irving will opt out to become an unrestricted free agent in 2019 because he signed his current deal before the cap surge. His next contract could wind up averaging upwards of $30 million per season, depending on where the cap falls in two years.
The Celtics are banking on Irving being a good fit next to Gordon Hayward and Al Horford, their major offseason signings of the last two summers. Hayward came over this July from the Utah Jazz, while Horford was the first domino in their new Big Three last summer.
All three players are under contract for at least the next two seasons, so they'll have an extended opportunity to see how this meshes together.