According to a source, the Chicago Bulls have reached a deal with DeMar DeRozan of San Antonio Spurs in a sign-and trade agreement.According to a source, DeRozan will sign a $85 million, three-year contract with the Bulls after Friday's lifting of the NBA's free agency moratorium. According to the source, San Antonio will be receiving forwards Thaddeus and Al-Farouq Aminu as well as a future pick in the first round.The March Nikola Vucevic deal means that the Bulls cannot trade their first-round pick until 2025 or 2026. It all depends on whether Chicago sends its top four or third protected pick to the Orlando Magic.According to the source, the Bulls will also send the Spurs a second-round pick in 2022 via the Lakers and a Bulls' 2025 second round pick.The Bulls have made significant roster changes over the last 24 hours. They acquired DeRozan, Lonzo Ball, and Alex Caruso, while also sending out Young, Aminu, and Tomas Satoransky to try and get back in the playoffs after five seasons.DeRozan will be 32 on Saturday. He averaged 21.6 points last year for San Antonio, and has scored more than 20 points per game each of the eight previous seasons. Four-time All-Star DeRozan spent his first nine NBA seasons with the Toronto Raptors. He was then sent to the Spurs with Jakob Poeltl for Kawhi Leonard, and Danny Green, before being traded to the Spurs.DeRozan had the three best assists totals in his three seasons with Spurs. DeRozan will likely be asked to play the role of a ball-handler/creator with the Bulls, alongside Zach LaVine and Ball in half-court offensive sets.Young had a great season last season with the Bulls, scoring 12.1 points, 6.2 rebounding and 4.3 assists in 68 games. Aminu, who was traded to the Bulls by Vucevic, played 23 games between Chicago and Orlando last season. He has also played 41 games in the Bulls' past two seasons, having signed a $30 million, three-year deal with Orlando for persistent knee problems.Both Young and Aminu have expired contracts.According to ESPN's Bobby Marks the Bulls have $20 million less than the luxury tax line to complete their roster. Chicago's main issue is still Lauri Markkanen, a restricted free agent forward.