The Damages actor has recurred as CIA agent Ryan Fletcher since the CW drama's first season.
He has been promoted to regular for the show's third run, TVLine reports.
Nikita - which stars Maggie Q - was picked up by The CW last week, with 22 new episodes debuting in the fall.
Last year, Dillon Casey was also promoted to the main cast of Nikita - the 28-year-old has played Division operative Sean Pierce since 2011.
The series currently airs on Fridays at 8/7c. Season two finale 'Homecoming' will air this Friday (May 18) on The CW.