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Dallas Cowboys linebacker Rolando McClain is being suspended for another year, on top of the 10-game suspension that was scheduled to end Monday, and there now are doubts he ever will get to play again in the NFL after recently missing yet another drug test, NFL sources told ESPN.

McClain is likely to appeal the latest suspension, according to sources.

Players suspended for a year do not have a high success rate of returning, and McClain now will be sitting out until at least November 2017 before he’s even eligible to apply for reinstatement.

McClain was serving a 10-game suspension for testing positive for opiates. Cowboys owner Jerry Jones already has said McClain would not be back with the team when his suspension was scheduled to end Monday.