After graduating high school, Robey-Coleman attended and played college football for USC. As a freshman, Robey-Coleman started all of the 2010 season when he became a cornerback after playing wide receiver in high school. He was named to the 2010 Collegefootballnews.com Freshman All-American honorable mention list, All-Pac-10 honorable mention, and Phil Steele's All-Pac-10 fourth team in recognition of his freshman season. Robey-Coleman put together a solid sophomore season in 2011. He started in all 12 games, posting a record of 63 tackles, a team-high nine deflections, and two interceptions. He made 12 punt returns for 132 yards total. He was a first-team All-Pac-12 selection and was named to the 2011 CollegeFootballNews.com Sophomore All-American second team. In his final season with the Trojans in 2012, Robey-Coleman would once again put together a solid season. He was a Jim Thorpe Award candidate and returned punts and kicks for the Trojans. He was a second team All-Pac-12 selection in 2012. Robey-Coleman decided to forgo his senior season and entered the 2013 NFL Draft.
Professional career
Buffalo Bills
Robey-Coleman was signed by the Buffalo Bills as an undrafted free agent following the conclusion of the 2013 NFL Draft. In a Week 7 matchup against the Miami Dolphins, Robey-Coleman recorded his first interception, returning it 19 yards for a touchdown. In the 2013 season, he recorded 39 tackles, 3.0 sacks, six stuffs, one forced fumble, and one interception. In his second season in the NFL, Robey-Coleman would put together a solid campaign, where he recorded 46 tackles, one sack, one stuff, and one pass defensed. On August 9, 2015, Robey-Coleman signed a two-year contract extension with the Bills. In the 2015 season, he recorded 46 tackles, one sack, and four passes defensed. In the 2016 season, Robey-Coleman recorded 35 tackles, two run stuffs, two interceptions, and seven passes defensed. On March 6, 2017, Robey-Coleman was released by the Bills.
Los Angeles Rams
On April 7, 2017, Robey-Coleman was signed by the Los Angeles Rams. In Week 3, he recorded an interception against the San Francisco 49ers that led to running backTodd Gurley to score his first touchdown of the game in the Rams 41-39 win. In Week 6 against the Jacksonville Jaguars, he recorded his second interception off a tipped ball by tight end Marcedes Lewis in a 27-17 win. He played in 15 games with four starts as the Rams' primary slot corner and nickelback, recording a career-high 49 tackles, nine passes defensed, two interceptions, and one forced fumble. On March 13, 2018, Robey-Coleman signed a three-year contract extension with the Rams. In the NFC Championship on January 20, 2019, against the New Orleans Saints, Robey-Coleman was involved in a controversial uncalled pass interference penalty late in the game when he collided with Saints receiver Tommylee Lewis. The Rams went on to win 26-23 in overtime, sending them to Super Bowl LIII. Following the game, Robey-Coleman admitted that he thought he should have been called for defensive pass interference. On January 25, 2019, Robey-Coleman was fined $26,739 for the hit on Lewis. During the Super Bowl, Robey-Coleman made a helmet-to-helmet hit on Rex Burkhead, which resulted in a personal foul. The entire game turned out to be a defensive struggle as the Rams eventually were defeated, 13-3. On February 10, 2019, Robey-Coleman was again fined $26,739. On March 17, 2020, the Rams declined the option on Robey-Coleman's contract, making him an unrestricted free agent.
Philadelphia Eagles
On March 31, 2020, Robey-Coleman signed a one-year contract with the Philadelphia Eagles.
