Wigan Athletic chairman Dave Whelan says Manchester United have done great business in selling Cristiano Ronaldo to Real Madrid.

He told Sky News: "When you look at this deal you think football has gone absolutely mad.

"For Ronaldo to be worth £80m is just staggering. Something has to happen in this game because things can't go on like this.

"The world record fee has just been broken while at Newcastle, the whole club can be bought for £100m."

Whelan pointed out Wigan's total income per year is much less than Ronaldo's transfer fee.

"Including what we get from the Premier League, our total revenue is just under £50m," he said.

"We have to survive, pay the wages and when you see something like this, it's a fabulous piece of business for Manchester United."