Both the Dallas Mavericks and the Boston Celtics will have to work around injuries to star players next season. The Celtics will be without Jayson Tatum for the entire season, while the Mavericks will be without Kyrie Irving for at least the start of the season.As both teams look to make deep runs in the playoffs next season, one NBA fan has put together a deal that would land Dallas a backcourt partner for Irving, and Boston a starting center to replace Kristaps Porzingis.The deal sees Dallas package 6-foot-10 center Daniel Gafford, who signed a three-year extension this summer, with PJ Washington, who is on a three-year $46.5 million deal. In exchange, the team lands Anfernee Simons, who is on a four-year $100 million deal, backup big man Neemias Queta and several draft picks in the 2026 NBA draft.While there has been no movement on this deal from either side, Simons would provide Dallas with a scoring threat to help offset Irving's absence in the early portion of the season.On the other hand, Boston receives a talented 3-and-D player in Washington, as well as a proven starting center in Gafford, who can anchor the team.Mavericks yet to sign PJ Washington to an extensionPJ Washington impressed last season with the Mavericks, averaging a career-high 7.8 rebounds per game to go along with 14.7 points, 2.3 assists, 1.1 steals and 1.1 blocks per game. Additionally, Washington shot the second-best 3-point percentage of his career, making 38.1% of his 4.2 attempts per game.Despite that, he and the Mavericks front office have yet to finalize an extension. Unless a deal is completed before the Oct. 20 deadline, Washington will become a free agent this summer.According to an Aug. 31 report from ClutchPoints, a deal seems likely; however, nothing is guaranteed. Joey Mistretta wrote:"People familiar with the situation have suggested that a contract extension remains likely. However, there is no official timeline for it to be announced. Additionally, the contract extension -- although likely -- is not guaranteed to come to fruition."With Anthony Davis expected to start the season healthy, and No. 1 pick Cooper Flagg eager to make waves, Dallas' front office hopes this season sees the franchise return to championship contention.Whether their final preparations for the start of this season include an extension for Washington, only time will tell.