Houston Rockets point guard Rafer Alston underwent tests during the offseason to rule out a potential heart condition, league sources told SI.com.

Two doctors examined Alston and both cleared him to play, according to the sources. Alston has been scrimmaging with the Rockets this week and will participate in training camp.

"Rafer had a few extra tests on his physical," Rockets general manager Daryl Morey told SI.com. "Everything came back negative. They were precautionary."

Morey declined to comment on the nature of the tests. A call to Alston's agent, Dan Fegan, was not immediately returned.

Alston averaged 13.1 points and 5.3 assists in 74 games with the Rockets last season.

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