Thursday April 6th, Kevin Gastelum (14-2-0) was flagged by the USADA after they found “Carboxy-THC”, a metabolite found in marijuana, above the decision level of 180 nano-grams per milliliter (ng/mL) from an in fight sample collected from his last bout March, 11, a win against Vitor Belfort.

Mar 11, 2017; Fo
rtazela, Brazil, USA; Kelvin Gastelum (blue gloves) fights Vitor Belfort (red gloves) during UFC Fight Night at Centro de Formacao Olimpica de Fortaleza. Mandatory Credit: Jason Silva-USA TODAY Sports

Gastelum was scheduled to fight Anderson “The Spider” Silva (34-8-0, 1 NC) as the co-main event for UFC 212 in Rio de Janeiro, Brazil on Satuday June 3. Silva last fought at 208 where he defeated Derek Brunson (16-5-0) by way of a controversial decision.

Brunson follows through on a punch that landed on the jaw of Silva (Courtesy LA Times

Per Ariel Helwani, journalist for mmafighting.com, top middleweight contender Yoel Romero  (12-1-0) has offered to step in to fight Silva.

Nov 12, 2016; New York, NY, USA; Yoel Romero (blue gloves) takes down and defeats Chris Weidman (red gloves) during UFC 205 at Madison Square Garden. Credit: Adam Hunger-USA TODAY Sports

Romero’s last fight was at UFC 205 at MSG where he defeated Chris Weidman (13-2-0) by knockout with a brutal flying knee in the third round.