Jorge Linares
On 10 April 2017, Eurosport and Sky Sports announced that Campbell would be involved in a WBA lightweight title eliminator against former WBA interim lightweight titlist Darleys Pérez (33–2–2, 21 KOs) on the Anthony Joshua vs. Wladimir Klitschko undercard at the Wembley Stadium on 29 April 2017. The winner would be in the number one position to challenge champion Jorge Linares. Pérez weighed over the limit at 136.3 pounds, so had he won the bout, he would not have been eligible for the mandatory spot. Campbell racked up the win via a ninth-round stoppage win, which was due to injury. It was said that Pérez hurt his left arm after a throwing a left hook. He signaled to the referee that he could not continue and the fight was stopped at 1 minute 28 seconds into the round. Although Pérez started the fight well, enough to win the first three rounds, he physically looked gassed by the later rounds where Campbell took over. With the win, Campbell was made the new mandatory challenger to WBA champion Jorge Linares. Eddie Hearn said he would speak to Golden Boy Promotions to push things forward for the fight to be made.