Chris Kavanagh should have shown Scott McTominay a second yellow card for his challenge on Heung-min Son in Tottenham v Manchester United if he thought it was a foul, according to Keith Hackett.

Speaking exclusively to Football Insider, the ex-FIFA and Premier League referee explained he did not think McTominay’s challenge was an offence but if Kavanagh did he should have been sent off.

The Scotland international fended off Son with his hand in the first half as he launched a move that Edinson Cavani finished off to open the scoring.

However, Kavanagh reviewed the incident on the pitchside monitor and felt Son was fouled and awarded Spurs a free-kick as a result.

McTominay had already been booked for an earlier incident but escaped further punishment.

“First of all, I’m not going to support a yellow for McTominay because in my eyes it wasn’t an offence,” Hackett told Football Insider correspondent Connor Whitley.

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“I know the view that and I practised it, if you give a yellow, the second yellow has to almost be orange before you give it.

“And that wasn’t a yellow. For me, that’s no offence and not a yellow.

“If that’s how he [Kavanagh] views it, then he should have given a yellow.

“I listen to some of the statements that the PGMOL said on Match of the Day and I’m thinking ‘What are they on about?’ because they’re using a different rule book to me.

“This was a flailing arm to hold off a challenge from a defender. That happens every day in every match.”

The PGMOL explained at half-time that “It wasn’t part of McTominay’s natural running movement and it was careless.”

Tottenham opened the scoring through Son shortly after the incident but eventually lost 3-1.

In other news, Harry Kane has privately delivered a scathing four-word verdict on Tottenham’s future.