Kell Brook defended his IBF welterweight title in Sheffield on Saturday night and then stepped up his bid to face Amir Khan. Sheffield's Brook thrilled his home city with a fourth-round stoppage of Romanian Jo Jo Dan, crowning his comeback from a life-threatening stabbing in Tenerife last summer.

It was Brook's first fight since beating Shawn Porter to win the world strap he had long coveted, and he left the baying crowd in little doubt as to who he wants next.

"If you're watching, come and get in this ring with me," Brook told Khan. Promoter Eddie Hearn added that Wembley Stadium was free for the pair on June 13.

WBA 'regular' super middleweight champion Carl Froch, who shares the same promoter as Brook, also called for Khan to take up the challenge.

"It is a big fight," he told Sky Sports. "Eddie Hearn called it on for Khan and there's no reason why Amir Khan shouldn't come to England and fight Kell Brook. I think Khan thinks he's too big for Kell Brook and fair play to him, he's been around on the scene for a while and he's fighting in Vegas and Amir Khan thinks hes a big shot.

"But Kell Brook is the world champion, Amir Khan's got no title. If he thinks he can beat Brook then come over here and try and take his world title off him."

Froch shares the Matchroom stable of course but refused to side with either British welterweight star should they fight.

"I think it will be a great fight," he said.  "It willl be a difficult fight. It's a fight that could go either way. Amir Khan has got fast hands, he's got bags of talent, he's skilful, he's got fast feet he's got a high work rate but Kell Brook has now got that belief and he's got that punch. I think Amir Khan is worried by that punch - on his whiskers like Kell said! I think that's a fantastic fight that should happen - but probably won't.  Amir Khan should come and fight Kell Brook."