The Blazers, Celtics, Grizzles, Heat, Spurs and Timberwolves are among teams attending a draft workout held by the Rockets this weekend.

The NBA instituted a new rule recently that allows teams to attend workouts hosted by other clubs as long as the costs are shared.

The workout in Houston will include about 40 players, predominantly college seniors.

"It's marginal guys, second-round guys that may be drafted," said an NBA source about the workout. "It's a way to save money and utilize the rule that allows other teams to come."