If Lewis makes the major league team, he'll make $2 million in base salary and can earn up to another $4 million in incentives.
Lewis, 34, hasn't pitched in the majors since the midway though the 2012 season. He had surgery to repair a torn flexor in his elbow and during this past season had hip surgery.
Lewis has not begun a throwing program, but the club expects him to be long tossing and making progress toward getting on a mound by the time the club arrives in Surprise, Ariz., in February.
Lewis made a total of seven rehab starts in 2013, three of them in May before he was shut down for six weeks because of biceps tendinitis. He tried again in mid-July with four more rehab starts. His last start came on Aug. 3 for Triple-A Round Rock, when he pitched five innings and allowed two runs.
Lewis, from Bakersfield, Calif, had made it clear he wants to return to the team that drafted him in 1999. He won 26 games for the Rangers in 2010 and 2011 combined; in the two seasons' playoffs, he was 4-1 with a 2.34 ERA.
Information from ESPNDallas.com's Todd Wills was used in this report.