Dunn, 27, has not played this season after being waived by the Grizzlies in October. As ESPN’s Adrian Wojnarowski noted, Dunn “gives the Blazers some backcourt depth with Anfernee Simons out 1-to-2 weeks.”
Injuries limited Dunn to four games with the Hawks last season. He appeared in 51 games with Atlanta the year before that, averaging 7.3 points, 3.6 rebounds and 3.4 assists.
The No. 5 overall pick in the 2016 draft, Dunn spent his rookie year with the Timberwolves. He has appeared in 231 games overall, compiling career averages of 8.2 points and 4.1 assists.
The Hawks traded him to the Celtics at the end of last season, and then the Celtics traded him to the Grizzlies. He has remained an NBA free agent since being waived by Memphis, though he has spent time in the G League.