Portland is in the luxury tax but Adams' salary won't count against the team's salary cap since he's a substitute player, according to ESPN's Bobby Marks.
Adams spent the entire 2019-20 campaign with the G League's Wisconsin Herd, averaging 21.5 points, 5.7 assists, 5.1 boards, and 1.8 steals while also shooting 40.7% from deep. The 6-foot guard was the runner-up in this season's G League MVP voting.
Adams went undrafted in 2018 after a stellar four-year career at St. Bonaventure. He signed a two-way contract with the Atlanta Hawks last season and made 34 appearances for the club in 2018-19.
Ariza won't be joining the Trail Blazers as he reportedly chose to spend a one-month visitation period with his 12-year-old son during the league's restart.