Frank McAvennie has slated former Sunderland defender Gary Breen for his assessment of Shane Duffy’s move to Celtic.

Speaking exclusively to Football Insider correspondent Dylan Childs, the Hoops legend claimed that Breen “does not know what he is talking about” and called his comments “utter nonsense”.

Breen, who made 64 appearances for the Republic of Ireland, claimed that Duffy would develop “bad habits” in Scotland and suggested that he may struggle when on international duty.

This incensed Bhoys boss Neil Lennon who bit back at Breen’s “unnecessary” and “unfounded” view yesterday when speaking in the build up to tonight’s game against St Mirren.

McAvennie insisted that switching the Amex Stadium for Celtic Park for one season will only benefit Duffy as a player.

“Listen, there has been big rumblings from England,” he told Football Insider.

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“Some boy saying that Duffy may lose his place in the Republic of Ireland side by coming to Celtic. What a load of utter nonsense that was.

“I have never even heard of the guy, he played for Coventry which just sums it up. It really does. He does not know what he is talking about. I cannot believe he said that about Duffy.

“He is going to come up here, get fit and play every game.”

Speaking to Off the Ball, Breen said: “This is a brilliant move for Celtic but the quality of player he is playing against now will be a big concern for Ireland.

“He is going to be playing against lesser quality and that is a concern. He might pick up a few bad habits (in Scotland), not because he is lazy but that he isn’t up against quality centre-forwards.”

In other Celtic news, Noel Whelan has told Football Insider that Hoops boss Neil Lennon will be “absolutely overjoyed” by ‘Massive’ transfer update.