While the additions were primarily because extra catchers are needed to handle the large number of pitchers when camp opens, Erickson and Wallach are considered among the better prospects in the organization, and both took part in the recent developmental camp for top prospects at Dodger Stadium.
Erickson, a 23-year-old switch-hitter with a big (6-foot-4, 220-pound) frame, hit .293 with 13 homers and 66 RBIs splitting the 2011 season between Class A and Double-A.
Wallach, the 25-year-old son of third-base coach Tim Wallach, hit .247 with three homers and 17 RBIs at Double-A, but missed two months with a broken finger.
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.