Coming out of UCLA, Moreau was projected by the majority of NFL draft experts and scouts to be a late first or second round pick.

On March 21, 2017, Moreau participated at UCLA's pro day and suffered a pectoral injury during his bench press.

[18] He competed with Kendall Fuller, Dashaun Phillips, and Josh Holsey for the job as the Redskins' starting nickelback.

[19] Head coach Jay Gruden named Moreau the Redskins' fifth cornerback on the depth chart to begin the season, behind Josh Norman, Bashaud Breeland, Kendall Fuller, and Quinton Dunbar.

[20] He made his professional regular season debut in the Redskins' season-opening 17–30 loss to the Philadelphia Eagles.

On October 15, 2017, Moreau recorded three combined tackles and his first career pass deflection during a 26–24 win against the San Francisco 49ers.

[22][23] In the following week against the Carolina Panthers, Moreau recorded his third interception of the season off a pass thrown by Kyle Allen in the 29–21 win.

[26] In Week 11 against the Cincinnati Bengals, Moreau intercepted a pass thrown by Ryan Finley late in the fourth quarter to secure a 20–9 win for the Football Team.

During his time at UCLA he was twice named to the Athletic Director's Honor Roll and majored in political science.

He cites his hobbies as working out and playing basketball and the athletes he most admires as Michael Jordan and former Oregon running back LaMichael James.