Cormier defeated Johnson at UFC 187 in May of 2015 to become the light heavyweight champion.
Cormier (18-1) is coming off a unanimous decision win over late-replacemnet Anderson Silva at UFC 200 back in July. Johnson (22-%) in his most recent fight, blasted Glover Teixeira in 13 seconds at UFC 202 in August of 2016. Johnson has won three fights in a row since his loss to Cormier.
Also announced for the UFC 210 card is former middleweight champion Chris Weidman vs Gagard Mousasi.
The event will take place in Buffalo New York, at the Keybank Center, only the second UFC event in Buffalo, the first coming in 1995 at UFC 7.