Amir Khan survived a second-round knockdown to maintain momentum in his comeback to the sport with a unanimous points win over Samuel Vargas.
Brook wants to come back down to 147lbs to face Khan at welterweight in a festive all-British showdown.
Former IBF welterweight champion Brook, 32, who fought last as junior-middleweight after two knockout defeats and two broken eye sockets, share the same promoter Hearn, who tried to make Khan-Brook in 2016 and past year.
Colombian-born Vargas had already been put down himself when he stunned Khan and the capacity crowd and with Brook watching at ringside, Khan recovered and floored Vargas again before eventually running out unanimous points victor.
But incredibly, with the fight seemingly under control, Vargas delivered on his pre-bout promise that he would find the former world champion's fragile chin, landing a right hand to send Khan crashing down.
Khan added: "He caught me with an overhand right hand, right on the button, I got back up and I was fine".
And little tangible progress, it seems, has been made towards the domestic super-fight that is Brook v Khan.
Khan has expressed to have a fight with Manny Pacquiao.
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AMIR KHAN believes the final chapter of his career will change how people read his ring record. Pacquiao, who has won world titles in eight divisions, stopped Lucas Matthysse in July and the Filipino has yet to announce plans for his next fight.
First he must overcome outsider Samuel Vargas in Birmingham tonight but then it is on to a much bigger fight in December.
"I want to be in the big fights and Brook is definitely someone we'll also look at", Khan said earlier this week.
"What I really wanted to do was go the distance".
Khan's blistering hand-speed helped him drop his Colombian counterpart twice. I've not got beat by dummies.
From there, Khan used his jab and quick combinations on the inside to outbox Vargas, who was bleeding heavily from the nose. Although Khan showed heart, there was little on show to concern Brook.
History is pitted with great "fights" that never happen.