By Keith Hackett

15th Nov, 2021 | 7:40pm

Ex-Fifa referee: Postecoglou told to do his 'homework' after controversial Celtic news confirmed

Celtic need to do their “homework” on Nick Walsh after he was confirmed as the referee for their Scottish League Cup semi-final against St Johnstone, according to Keith Hackett.

Speaking exclusively to Football Insider, the ex-Fifa and Premier League referee backed Walsh to put in a good performance at Hampden Park.

The Scottish FA confirmed Walsh will be in charge when Celtic take on the holders this weekend.

The 30-year-old was involved in controversy at Parkhead earlier this season when he did not send off Chris Kane for an incident with Cameron Carter-Vickers. Instead, both players were shown yellow cards.

“You have to look at whether the referee who is going to be appointed is in top form,” Hackett told Football Insider correspondent Connor Whitley.

“They’ve got a pool of top-class referees who are invariably going to get the big teams on a fairly regular basis.

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“I go back to the management of Celtic, ‘Ok, you’ve got this referee. Do your homework’.

“Review where he cautioned and where he dismissed in the past. Look at certain nuances, is he good at set-piece management? What’s he like physically?

“The point is, the importance of the team doing its homework on a specific referee. What’s his temperature gauge in a game?

“I knew, as the boss of the PGMOL, each individual referee’s yellow and red card sanctions and when in the games he produced them.

“A referee comes into a game with a clean slate. He doesn’t come in with his own history with a team.

“Every time you referee a top team it enhances your experience. Here’s a referee, I think he’s a very good referee. He’s got a great deal of experience, he’s earned the appointment.

“Just be mindful of where the shortcomings were last time. Where does he give yellow and red cards? What were his errors?

“The referee goes in there with a blank canvas. He is there to apply the laws. He doesn’t miss the open goals, he doesn’t give away a penalty. What you’re expecting him to do is be fit and mobile and make good judgements.

“I am certain that anyone that is going to referee the big teams in Scotland, just lift a gear.”

In other news, ‘agents are working’ on a £5million Celtic player’s potential January exit.