AN AMERICAN college football coach has denied claims he ate his own snot during a match on Saturday.

Video footage has emerged in which Michigan manager Jim Harbaugh appears to pick his nose and eat it during the Wolverines' 51-14 home win over UCF Knights.

But the Ohio-born boss, 52, said: "I have never eaten a booger in my entire life.

"It might have looked like that was happening. But if you rub your nose and then you bite your fingernail, that's not eating a booger. There was no booger eaten.

"For clarity here, for the record, I have never eaten a booger in my entire life."

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The filthy footage draws stark comparison with Germany chief Joachim Low, who was caught digging around in his nostrils before chewing his findings in a Euro 2012 match against Portugal.

Low, 56, was forced to apologise after his disgusting scratch and sniff at Euro 2016.

2 Jim Harbaugh appears to pick his nose during Michigan's win over UCF Knights Credit: Twitter: @benmaller

2 The Wolverines manager then seems to eat his own booger afterwards Credit: Twitter: @benmaller

The German put his hands down his trousers and smelled his fingers during his side's win over Ukraine.

He later said: "It was adrenaline and concentration. I will try to behave differently in the future.

"I saw the pictures and obviously sometimes you do things subconsciously. It happened and I am sorry."