VANCOUVER, British Columbia (AP) _ The Vancouver Grizzlies completed two separate trades Tuesday, acquiring forward Tony Massenburg from the Boston Celtics and forward Sam Mack form the Houston Rockets.

The Grizzlies also received a future second round-draft pick from the Celtics in exchange for second-year forward Roy Rogers.

In acquiring Mack, Vancouver gave up a second-round pick.

Rogers' departure comes less than a week after he questioned his teammates' commitment following a 113-83 preseason loss to the Phoenix Suns.

Selected 22nd overall in the 1996 draft, Rogers played in all 82 games for the Grizzlies last year, averaging 6.6 points, while setting a franchise record with 163 blocked shots.

Massenburg, who signed as a free agent with the Celtics last July, spent last season with the New Jersey Nets. A five-year veteran, who broke in with the San Antonio Spurs, Massenburg has averaged 7.4 points and 5.3 rebounds over his career.

Mack, entering his fourth NBA season, played in 52 games for the Rockets last year, averaging 5.6 points.

In other moves, the Grizzlies waived Litterial Green, David Booth and Alan Ogg _ all training camp invites _ to bring their roster down to 15 players.