At the 2010 NFL Scouting Combine, Petrus completed 45 reps of 225 pounds (102 kg) on the bench press, which tied defensive linemen Leif Larsen and Mike Kudla for the second most since 2000.[12]
He was drafted by the New York Giants in the fifth round of the 2010 NFL draft. He was the seventh guard to be selected that year.[13] He played in 17 regular-season games with three starts. In the 2011 season, the Giants finished with a 9–7 record and made the playoffs.[14] He appeared in all four 2011 postseason games, including the Super Bowl XLVI victory over the New England Patriots.[15][16]
Petrus was waived on September 2, 2012, after the Giants were awarded offensive tackle D. J. Jones on waivers from the Philadelphia Eagles. Jones failed his physical with the Giants and Petrus was re-signed the next day.[17]
On November 3, Petrus was released by the Giants after tight end Travis Beckum was activated.[18]
New England Patriots
The New England Patriots signed Petrus on November 13, 2012, to help with a depleted offensive line that included injuries to Logan Mankins and Dan Connolly.[19] He was released by the Patriots on December 3, 2012.[20]
Tennessee Titans
On December 6, 2012, Petrus was claimed off waivers by the Titans.[21] He played in two games with the Titans in the 2012 season.[22] He was waived by the Titans on March 12, 2013.[23]
After his stint with the Titans, Petrus did not sign with another NFL team and retired.[24]
Personal life
Petrus played bass guitar in a band called Vikings of the North Atlantic.[25]