Lewis, who hasn't pitched since 2012, says he has been dealing with hip pain during his comeback from surgery last year to repair a torn flexor tendon in his right elbow.
The repaired elbow has felt good, but Lewis said Tuesday the hip problem has progressed to affecting his mechanics.
Lewis, the team's most successful postseason pitcher, had been pitching in rehabilitation games. He had been expected to possibly be in the Rangers rotation in the next couple of weeks. After his elbow surgery last year, the Rangers gave him a $2-million, one-year deal for 2013.