Davis, who played last season for the Los Angeles Lakers, averaged 8.3 points, 7.6 rebounds and 1.2 blocks in 2014–15.
The 26-year-old was the No. 13 draft pick in 2010 and has also played for the Toronto Raptors and Memphis Grizzlies. He has started 82 games over his five-year career and has a career 55.6% shooting percentage.
Portland went 51–31 last season and lost to the Grizzlies in the first round of the playoffs.
- Molly Geary