Richard Keys and Andy Gray row over Erling Haaland transfer after Jadon Sancho comparison

Pundits Richard Keys and Andy Gray got into a heated debate as they discussed Erling Haaland's blockbuster move to Manchester City - with Keys insisting that Haaland still has to 'prove himself' just like his old Borussia Dortmund team-mate, Jadon Sancho.

City confirmed on Tuesday afternoon that they had agreed a deal 'in principle' with Dortmund worth £51million to sign Haaland. The 21-year-old was one of Europe's most coveted stars after firing 85 goals in just 88 games for Dortmund, but a release clause enabled City to pull off the heist of the century by luring him to the Etihad for a knockdown fee.

But despite the duo agreeing that City had bagged a bargain, Keys was adamant that Haaland still has to prove that he is "the real deal". And to emphasise his point, Keys outlined that Sancho was billed as a "boy wonder" before joining Manchester United last summer but has flopped in the Premier League.

Speaking on beIN SPORTS, Keys said: "In an open market he's probably worth, what, £120m?" Gray was adamant, however, that Haaland was worth far more than that sum. He insisted: "No, he's worth more than Harry Kane. He's 21? 22?"

Keys added: "He certainly might be, Andy, but so was Jadon Sancho and he's done nothing in his first year at Manchester United. I still think it isn't a gamble, but we're into the unknown. I don't think he's yet proven that he is the real deal."

But Gray fired back, insisting that Haaland has already proven himself: "Well, listen, everywhere he's been and gone, everywhere he's been asked to step up and prove [himself], he's done it. So far.

"This is his biggest challenge, the Premier League is his biggest challenge. And also, like I've said before, the thing you need to be sure of is that the