JAMIE Cox's trainer John Costello has brushed aside jibes from George Groves that size will matter during Saturday's World Boxing Super Series showdown at Wembley's SSE Arena.

Groves, who will be making a first defence of the WBA Super title he claimed earlier this year in the all-British Muhammad Ali Trophy quarter-final showdown against the Swindon man, reckons he holds a key advantage over the undefeated man from Wiltshire.

“I’ve always done well against guys I’m naturally bigger than,” said the 29 year-old champion Groves.

“Jamie is not so big so if he comes in heavy he is going to be slow. He fights at middleweight and could probably even make super welter if he needed to.

“He has had to bulk up to get to the super middleweight division. I don’t. I could never make middleweight. I have to have a full camp to make super middleweight. I make it and I make it well.

"I’m physically strong and on point when I’m there, but I couldn’t do anything lighter. Size is going to be very important on the night and I believe I’ll end the fight before the distance.''

Costello though believes Cox has rejected that notion and believes his man has the measure of any 12 stone fighter on the planet.

“We always wanted this fight with George Groves,'' said the trainer.

"We’d asked for this fight before so when George picked Jamie in Monte Carlo we was in our element. All our Christmases had come at once.

‘’I’ve said it before and people have laughed at me. I’ve believe Jamie can beat any 12 stone fighter on the planet. People are talking about size but that has no relevance for me.

"Carl Froch was 12 stone 4 when he fought George Groves at Wembley, and I believe George was over 13 stone.

"Jamie will be heavier than 12 stone 4. Jamie would be dehydrated if he got into the ring at 12 stone 4.

“Size had no relevance that evening and it will certainly have no relevance on Saturday night. Jamie’s ability and what he brings will be very relevant because we’re taking that WBC Super Championship home with us. That’s 100 per cent set in stone.

"We’re here to a do a job and that’s what we are going to do. George Groves made a big mistake when he picked Jamie Cox.”

Cox himself says hunger, rather than size, will be the determining factor on Saturday.

“George Groves has been eating lobster, while I’ve been eating crisp sandwiches,’’ said the Swindon ace, who has a pro record of 24-0.

“We live completely different lives. I’m the hungrier fighter. This is a big opportunity for me and I’m going to take it. I’m feeling good, I’m ready and I’m looking forward to the occasion."

Tickets for Saturday's fight are still available at ssearena.co.uk/.