Joshua Buatsi's comeback and Chantelle Cameron's world title fight are on Sunday night, live on Sky Sports
Hearn revealed he was the only person to return a positive result in the latest batch of testing ahead of this weekend's card at the Marshall Arena in Milton Keynes, live on Sky Sports.
"Gutted to just find out I tested positive for Covid-19 today and have to leave the bubble immediately. Thankfully all other tests were negative. Heading home to rest - catch up tomorrow," he said on Twitter.