Celtic striker Leigh Griffiths has “been doing extra training” ahead of the first Old Firm clash of the season, according to Frank McAvennie.

The Parkhead legend, speaking exclusively to Football Insider correspondent Dylan Childs, was blown away by the 30-year-old’s “fantastic” goal at the weekend after a lengthy spell out.

Griffiths scored a 90th minute winner on Sunday as the Hoops produced a late rally to beat St. Johnstone 2-0 at McDiarmid Park.

It was the Scotland international’s first appearance of the season having missed the first month of action with a calf strain.

His return to form is timely with Albian Ajeti injured and star striker Odsonne Edouard testing positive for Covid-19 yesterday.

When asked by Football Insider for his assessment of Griffiths’ return to action, McAvennie said: “Looking at the bigger picture, it is great for Griffiths.

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“He has worked his socks off and from what I hear he has buckled down and he has been doing extra training. Sometimes you have got to do that. They have given him so many chances and this is him responding to it.

“I am delighted for him because he is a top, top striker. He has not played for such a long time but that header was the finish of a veteran. It was fantastic.”

Speaking on his future after the win, Griffiths said: “I spoke to the gaffer at length many times and he always said as long as he is here, I will be here.

“I just need to keep working on my fitness and make sure that when I am called upon that I make an impact.”

In other Celtic news, Noel Whelan tips Hoops to revisit move for Premier League midfielder in January after Sky reveal.