The Mets placed Warren on the 15-day injured list Wednesday with a right forearm strain.
The injury could help explain Warren's recent struggles, as he's coughed up nine runs over his last two outings. Prior to those two appearances, Warren had posted a 2.45 ERA and 36:16 K:BB over 33 innings. The Mets have not provided a timeline for Warren's return, but the nature of the injury suggests it will likely be longer than a minimum absence.