The Triple-A Albuquerque manager and former Dodgers third baseman will join the big league club after the Pacific Coast League season concludes and remain with the club until the season ends. His presence will only further stir speculation about the future of manager Joe Torre and who succeeds him if Torre doesn't return.
Hitting coach Don Mattingly has been the presumed heir apparent to Torre since both arrived three years ago, and there have been no indications that anything has changed.
Meanwhile, Wallach has been paying his dues managing at Triple-A the past two seasons. He spent two weeks last September with the Major League team and has spoken before about his desire to become a Major League manager.
Wallach's Isotopes went into Saturday night's play in second place in the American Southern Division, three games out with three games to play. Last year, his first at Albuquerque, Wallach led the Isotopes to a division title and a club-record 80 wins. He was named the league's Manager of the Year and Baseball America's best manager prospect.
Like Mattingly, Wallach has player credibility with a 17-year big league career, five All-Star selections, three Gold Gloves and two Silver Sluggers.