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Beck, a second-round selection in the 2012 MLB Draft, made his big league debut for the White Sox last season, allowing four runs in six innings, and also logged a 3-2 record with a 3.15 ERA in 10 starts for Triple-A Charlotte. Fields played in one game for the Tigers last season.
Six players -- Colin Kleven, Will Lamb, Omar Narvaez, Peter Tago, Nik Turley and Josh Wall -- were reassigned to Minor League camp. The White Sox have 55 players -- 26 pitchers, five catchers, 14 infielders and 10 outfielders -- remaining in their big league camp.
Spencer Fordin is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.