Shakur Stevenson will fight Tuesday night without his assistant trainer in his corner.

The Nevada State Athletic Commission will not allow Kay Koroma to work Stevenson’s corner for his fight against Felix Caraballo because Koroma has been in contact with Mikaela Mayer. Koroma tested negative for COVID-19 on Saturday, but he is the assistant trainer for Mayer, who tested positive for the virus and was removed from Tuesday’s card.

In accordance with the COVID-19 protocols the NSAC and Top Rank put together, all members of Mayer’s team were required to leave Top Rank’s restricted area, “the bubble” to which promoter Bob Arum has referred. A Top Rank official confirmed to BoxingScene.com on Monday night that Koroma has left MGM Grand Conference Center in Las Vegas, the site of Tuesday night’s card, as have Mayer and her head coach, Al Mitchell.

ESPN.com first reported Monday night that Koroma can’t work Stevenson’s corner.

Edward Jackson will temporarily replace Koroma, who has worked with Stevenson since 2014, in the unbeaten WBO featherweight champion’s corner. Wali Moses, Stevenson’s grandfather, also will work his corner Tuesday night, just as his head trainer has done throughout Stevenson’s career as an amateur and professional.

Stevenson’s status for the main event wasn’t impacted by Koroma’s connection to Mayer because Stevenson didn’t come in contact with Mayer (12-0, 5 KOs). Mayer, a 2016 U.S. Olympian, was supposed to fight Helen Joseph (17-4-2, 10 KOs) in the 10-round, co-featured bout.

Mayer mostly trained for her canceled contest in Colorado Springs, Colorado, where Stevenson normally trains. Stevenson prepared for the Caraballo bout exclusively in Houston for logistical reasons.

“Typically, when a person in any camp tests positive, the contact tracing takes place,” Bob Bennett, the NSAC’s executive director, told ESPN.com. “And if it’s revealed that the person tested positive from contact tracing was in contact with that person, then obviously they could be asymptomatic, and they would be removed from the event as well.”

Stevenson appeared undeterred by Koroma’s removal from the event.

“I’m disappointed that he won’t be able to be in my corner,” Stevenson said, “but I am fully focused and locked in on tomorrow night and will put on another great show on ESPN.”

The 22-year-old Stevenson (13-0, 7 KOs), a southpaw from Newark, New Jersey, is heavily favored to beat Puerto Rico’s Caraballo (13-1-2, 9 KOs) in a 10-round, non-title fight that’ll be contested at the junior lightweight limit of 130 pounds.

ESPN will televise Stevenson-Caraballo as the main event of a five-fight card set to start at 7 p.m. ET/4 p.m. PT. The show will mark the first televised card in the United States since the coronavirus crisis brought boxing to a halt in mid-March.

All 10 boxers scheduled to appear on the card will be tested again Tuesday for COVID-19.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.