If the Raptors were to release the cap holds of free agents Luis Scola, Jason Thompson and James Johnson, Toronto would still be $1.5 million over the cap. The Raptors would certainly need to sacrifice one of their core players to create room. DeRozan’s $15 million cap hold has Toronto right at the cap. Biyombo, who has made $14.3 million in his career, could earn that in the first year of his new contract. Read more http://sports.yahoo.com/news/summer-agenda--toronto-raptors-152312946.html
Unless they need cap space to sign someone, they can re-sign their own free agents and go over the cap. They also get the MLE to sign a player while over the cap.