It looks like the Cavs-Celtics blockbuster is now complete. Boston will include an additional pick, a second rounder, as per Adrian Wojnarowski of ESPN.
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Cleveland and Boston engaged in further haggling when the Cavs were concerned about the medicals of guard Isaiah Thomas, who is recovering from a hip injury. Cleveland wanted to acquire more of Boston's top young prospects such as Jaylen Brown or No. 3 overall pick Jayson Tatum or a future first-round draft pick as a result, but Boston wouldn't budge.
As it stands, Boston will reportedly ship Thomas, Ante Zizic, Jae Crowder, the 2018 Brooklyn Nets pick, and the second rounder, in exchange for Irving.