The National Basketball Players Association is considering filing a grievance with the NBA after the Detroit Pistons voided a trade with the Houston Rockets due to concerns about the back of Donatas Motiejunas.

Sources close to Motiejunas believe the voided trade could damage his status as a restricted free agent next offseason.

Motiejunas had back surgery in April.

"Medical clearance was not given on all players and the trade is being rescinded," Pistons general manager Jeff Bower said in a statement four days after the deal.

Motiejunas has since questioned the validity of the Pistons' decision, telling Basketnews.Lt in his native Lithuania that he was "screwed."

"The team doctor simply says whether you pass or don't, although they may not do any checks," Motiejunas told the website. "Those 48 hours actually just let the team decide whether they want you or not. The Pistons announced I did not pass the medical, although I surely did pass it and played even before it. I just got screwed. The injury was a pretense to call of the trade. They changed their minds."