Teheran exited Monday's outing after experiencing tightness in his back, Evan Woodbery of MLive.com reports.
Teheran left the game after completing two innings on 30 pitches. His exit was deemed precautionary by the team, but no further details were provided. Teheran has reportedly shown increased velocity this spring in his battle for a rotation spot, though any time he is forced to miss would weaken his chances.