Both recruits posted about their commitments on social media websites late Saturday.
Both are tackles. McGovern (New Lenox, Ill./Lincoln-Way West) is 6-foot-6, 270 pounds; Bivin (Owensboro, Ky./Apollo), 6-6, 290, is on the ESPNU 150 Watch List.
The Irish now have five verbal commitments from the class of 2013, with four coming this month. ESPNU 150 Watch List tight end Jacob Matuska (Columbus, Ohio/Bishop Hartley) committed March 7, and athlete James Onwualu (Saint Paul, Minn./Cretin-Derham) committed one week later.
ESPNU 150 Watch List offensive tackle Steve Elmer (Midland, Mich./Midland) was the Irish's first commitment from the 2013 class, back in September.