Officials confirmed the 155-pound title fight with ESPN.com, following an initial report by MMAFighting.com. The Bellator 180 pay-per-view event will take place at Madison Square Garden.
Chandler (16-3) is coming off an exhilarating title defense against former UFC champion Benson Henderson at Bellator 165 in November. Chandler won the fight via split decision.
A former collegiate wrestler at University of Missouri, Chandler has won four in a row, including a knockout win over Patricky Freire last June to reclaim the Bellator championship. He first won the title in 2011, but surrendered it to Eddie Alvarez in a split decision loss in 2013.
Primus (7-0), of Portland, is 5-0 in the Bellator cage. He fought just once in 2016, picking up a split decision win in April.
A grudge match between two-time UFC title challenger Chael Sonnen and Wanderlei Silva will headline Bellator 180. A heavyweight fight featuring Fedor Emelianenko and Matt Mitrione has also been announced.