Rangers manager Jeff Banister said that Martinez was available out of the bullpen for Sunday's game against the Angels, T.R. Sullivan of MLB.com reports.
Though Martinez ended up going unused Sunday, it's expected that barring injury, he'll remain in a relief role for the rest of the season after the team acquired Miguel Gonzalez from the White Sox last week to fill out the rotation. Much like Austin Bibens-Dirkx, Martinez will likely serve as a long man in the bullpen, mopping up during blowout contests or covering multiple innings when any of the team's rotation members turn in abbreviated starts.