LeRibeus was selected 71st overall in the 2012 NFL Draft by the Washington Redskins. While at SMU, he was a teammate of future Redskins teammates Richard Crawford, who the Redskins would later draft in the seventh round, and Aldrick Robinson, who was the Redskins' 6th round pick in 2011. After the Redskins' rookie mini-camp, head coach Mike Shanahan announced that LeRibeus will primarily be playing guard and will be a backup center, providing competition for Erik Cook. On July 18, 2012, he officially signed with the Redskins to a four-year contract. During training camp, he split snaps at the left guard position with Maurice Hurt after Kory Lichtensteiger had arthroscopic surgery on his right knee. He made his NFL debut against the Carolina Panthers in Week 9. Despite playing only five games, Redskins coaching staff believed LeRibeus had a chance to compete for a starting position in the next season.
During the 2013 offseason training camp, LeRibeus came 30 pounds overweight and out of shape. He was listed as inactive for the entire 2013 season.