UFC 212: Aldo vs. Holloway was a mixed martial arts event produced by the Ultimate Fighting Championship held on June 3, 2017, at the Jeunesse Arena in Rio de Janeiro, Brazil.

Gastelum tested positive for Carboxy-Tetrahydrocannabinol (Carboxy-THC) which is a metabolite of marijuana or hashish above the 180 ng/mL allowance by the World Anti-Doping Agency (WADA) standard.

[4] As of April 10, 2017, it was confirmed that former Strikeforce and UFC Middleweight Champion Luke Rockhold was offered the fight and accepted it.

[5] In turn, Silva dismissed the idea a day later, citing that Rockhold was coming from a loss and because of that it wouldn't make sense.

[6] On May 1, Silva gave the UFC an ultimatum: he wants to fight 2000 Olympic silver medalist and former world champion in freestyle wrestling Yoel Romero for the interim title or he will retire.