The Portland Trail Blazers on Tuesday signed Gary Payton II, Cameron Oliver and Chinanu Onuaku to training camp contracts, adding a trio of young players to their preseason roster.

The Blazers feature the NBA-maximum 15 players under contract for the 2018-19 season, but can still sign up to two players to two-way contracts. Presumably, these three players will be auditioning for two-way contracts during the preseason.

Payton, a 6-foot-3 guard from Oregon State, has averaged 3.1 points and 1.9 rebounds in 29 games with the Milwaukee Bucks and Los Angeles Lakers the last two seasons, splitting time with the NBA teams and their G League affiliates. He's the son of Hall of Fame point guard Gary Payton.

Onuaku, a 6-10 forward from Louisville, was selected No. 37 overall by the Houston Rockets in the 2016 NBA Draft and played in six games with the Rockets the last two seasons, averaging 3.0 points, 2.3 rebounds, 0.7 assists and 12.3 minutes.

Oliver, a 6-8 forward from Nevada, is entering his second professional season. He averaged 10.8 points, 7.1 rebounds and 1.2 assists in 39 NBA G League games last season.

Two-way players spend the bulk of the season in the G League and no more than 45 days with their NBA team. One of the Blazers' two-way players from last season, Wade Baldwin, earned a late-season call-up and, ultimately, a spot on the NBA roster next season.

Joe Freeman | jfreeman@oregonian.com | 503-294-5183 | @BlazerFreeman