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Detroit Pistons C Aaron Gray will miss training camp after cardiac episode

  • Detroit Pistons coach Stan Van Gundy stands with guard Brandon Jennings (7) and forward Josh Smith (6) during media day at the team's basketball training facility in Auburn Hills, Mich., Monday, Sept. 29, 2014. (AP Photo/Carlos Osorio)

    Detroit Pistons coach Stan Van Gundy stands with guard Brandon Jennings (7) and forward Josh Smith (6) during media day at the team's basketball training facility in Auburn Hills, Mich., Monday, Sept. 29, 2014. (AP Photo/Carlos Osorio)  (The Associated Press)

  • Detroit Pistons center Andre Drummond addresses the media during media day at the team's basketball training facility in Auburn Hills, Mich., Monday, Sept. 29, 2014. (AP Photo/Carlos Osorio)

    Detroit Pistons center Andre Drummond addresses the media during media day at the team's basketball training facility in Auburn Hills, Mich., Monday, Sept. 29, 2014. (AP Photo/Carlos Osorio)  (The Associated Press)

  • Detroit Pistons forward Josh Smith, left, guard Brandon Jennings, center, and center Andre Drummond stand around during media day at the NBA team's basketball training facility in Auburn Hills, Mich., Monday, Sept. 29, 2014. (AP Photo/Carlos Osorio)

    Detroit Pistons forward Josh Smith, left, guard Brandon Jennings, center, and center Andre Drummond stand around during media day at the NBA team's basketball training facility in Auburn Hills, Mich., Monday, Sept. 29, 2014. (AP Photo/Carlos Osorio)  (The Associated Press)

Detroit Pistons center Aaron Gray is out indefinitely after suffering a cardiac episode last month.

Gray had the problem, which he didn't discuss in detail, after a voluntary practice session at the Palace. He said Monday he is still undergoing testing to find out exactly what needs to be done. He says there is no timeline on his return.

Gray was signed during the summer to back up Andre Drummond and Greg Monroe at center. The Pistons have signed Hasheem Thabeet to a non-guaranteed contract to provide some depth at the position.