Umenyiora played college football for the Troy State Trojans, the only program to offer him an athletic scholarship. At Troy, Umenyiora was moved from nose guard to defensive end. In 2002, he set school records in tackles for loss in a single season and sacks in a single game. He finished the 2002 season with 15 sacks, the second-most in NCAA Division I. He was inducted into the Troy University Sports Hall of Fame in 2014.
Professional career
New York Giants
Despite not being invited to the 2003 NFL Draft Combine, Umenyiora was drafted in the 2nd round of the 2003 NFL Draft by the New York Giants out of Troy University. Umenyiora established himself as a premier pass rusher in 2005, his first year as a starter. His stellar play earned All-Pro recognition and a trip to the Pro Bowl. Umenyiora achieved 14.5 sacks and 70 tackles, second only to the sixteen sacks obtained by Derrick Burgess of the Oakland Raiders. On December 23, 2005, the Giants signed Umenyiora to a six-year contract extension for $41 million with $15 million guaranteed. In the fourth game of the 2007 season, Umenyiora set a Giants franchise record by recording six sacks against the Philadelphia Eagles. At that point in the season, the Giants had 12 sacks, tying the NFL record. He recorded his first career touchdown on October 21 against the San Francisco 49ers when he sacked Trent Dilfer, forced a fumble, recovered the fumble and ran 75 yards for the score. By the end of the season, Umenyiora's 13 sacks helped the Giants to an NFL regular season-leading 53 sacks. The Giants had a surprise victory in Super Bowl XLII over the New England Patriots, in part because of their strong pass rush performance. Umenyiora had four tackles in that game, three of which were solos. During a preseason game against the New York Jets, Umenyiora suffered cartilage damage in his left knee and was required to undergo season-ending surgery. The finding by team physician Russell Warren was that Umenyiora suffered a torn lateral meniscus. Umenyiora joined ESPN's Monday Night Football crew on October 13, 2008. In week 1 of the 2009 season against the Washington Redskins, Umenyiora recorded his second and final career touchdown, also on a sack, forced fumble, and recovery. On November 5, 2010, Umenyiora was named the NFC Defensive Player of the Month after recording 18 tackles, 7.0 sacks, and six forced fumbles in the Giants' four October wins. Umenyiora and teammate Justin Tuck recorded 11.5 sacks for the year, and combined for 16 forced fumbles. On July 29, 2011, Umenyiora did not report on the opening day of the Giants' training camp. As a result, the Giants placed him on Reserve/Did Not Report. He reported to camp late the following day. Umenyiora has claimed that general manager Jerry Reese promised to renegotiate his contract after the 2010 season, but failed to do so. Umenyiora began practicing with his teammates on August 15, but after three practices he had arthroscopic surgery on his right knee. The team expected him to miss the season opener against the Washington Redskins on September 11.