The UFC 200 card is slowly coming together.
Hendricks (17-4) is coming off a first-round TKO loss to Stephen Thompson in March. That loss marked the first time in Hendricks' career that he was finished by an opponent.
Gastelum (11-2) most recently lost to Neil Magny via split decision in November.
UFC 200 is set for the new T-Mobile Arena in Las Vegas. While the promotion has yet to officially announce any fights for the landmark event, Conor McGregor vs. Nathan Diaz 2, Cain Velasquez vs. Travis Browne and Gegard Mousasi vs. Derek Brunson are expected to be on the card.