Fighting at 150 pounds at the weekend, the same weight could be a starting point for Khan as Brook has only just moved up and should still be able to get somewhere near his old poundage.
Khan had not fought since a knockout loss to Saul "Canelo" Alvarez in May 2016, but showed no lingering mental scars as he ruthlessly attacked Lo Greco from the opening bell.
Khan, however, added: "I want to fight the best guys".
"The weight is an issue with Kell, I'm a 147lb fighter".
But an unimpressed Brook said: "He doesn't want the fight, he just ran off".
The plan now seems to get both fighters out in similar level outings in June or July before a deal is thrashed out for a fight towards the end of the year. That fight I'm not rushing and I'm not running away from. Promoter Eddie Hearn admits it will be a complex fight to negotiate and sign, though the Matchroom Sport boxing chief is optimistic it will eventually take place. Kell Brook has been living off my name for a long time. I trained for a 12-round fight. "I'm two years out of the ring but I'm back with a big bang". Khan's defensive vulnerabilities - against his effectiveness as an attacking fighter with arguably the fastest hand speed in the sport - intrigues both the boxing aficionado and the wider sporting public and, at this stage, bad boy Broner would make a flawless summer opponent, if it is not to be Brook.