Greg Taylor's adaptation to Ange Postecoglou's inverted full-back role has been so impressive he is performing in a manner even Danny McGrain couldn't, according to Celtic great Peter Grant.

Taylor bagged his third goal in 28 appearances this season on Wednesday night when he confidently lashed home the opener during the 3-0 Premiership win over Livingston at Celtic Park.

The left-back's form under Postecoglou has been remarkable - especially with the responsibility of moving into midfield that comes with the Aussie's tactical plans.

Grant joked that he played alongside the greatest Hoops full-back of all time - the one and only McGrain - but even he couldn't do what Taylor is doing for this current team in an attacking sense.

The former Alloa Athletic and Dunfermline coach revealed that Taylor has always had a scoring threat in his locker though - after witnessing him stun Brazil for Scotland when he scored the winning goal in a 1-0 win against the South Americans at the Toulon Tournament in 2017.

"The inverted full-back role at Celtic is something else entirely now," Grant said. "I have watched Greg and he looks so comfortable in his own skin playing as an extra midfielder. He has really grown into the role.

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"I played with the best Celtic full-back of all time - Danny McGrain. Now Danny would run up and down the side of the pitch and he was an unbelievable defender... but he was never a midfield player.

"I was fortunate to work with the Scotland under-20s at the Toulon Tournament in 2017. I worked with Greg and he scored a sensational winner against Brazil when he rifled one into the top corner.

"It was great because his strike against Livingston for Celtic on Wednesday night brought back memories of that wonderful occasion for me. I knew back then in Toulon that Greg possessed real quality as a player.

"Greg has been excellent on that left-hand side. He has absolutely fantastic in the role that he is being asked to perform at club level."

Meanwhile, Grant also reckons that midfielder Matt O'Riley is still having a decent season for the Hoops despite failing to hit the target thus far in the campaign.

The 57-year-old still remembers O'Riley well from his coaching days in Fulham's youth system - when he utilised him in a more defensive midfield role.

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Grant added: "Look at Matt's stats and while you can argue that he is not having the greatest season this year compared to the last campaign he has still contributed the most assists [O'Riley leads all players in the top flight].

"He was playing in Callum McGregor's role for a few months of the season when the captain was out. He may have been less effective because it was a deeper, lying role but he played it very well and Celtic never dropped a Premiership point in the skipper's absence and the performances of Matt had a lot to do with that.

"He is a quality player and the more defensive midfield position is a role that I played him in for Fulham. I wanted him to learn to use the ball as well as learn the defensive side of the game. The defensive side of football is so important when you occupy that position. Matt was able to work on his game intelligence and he has blossomed into an excellent player because of that."

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With a nine-point cushion at the Premiership summit, Grant insists this Celtic side is a far stronger team than the one that thrashed Rangers 3-0 a year ago.

"I don't think they will ever be allowed to get weaker," Grant said. "The manager won't allow that to happen. He has spoken before about how he has tried to bring in two quality players for every position.

"That's why the training ground becomes vital to any success. That creates a competitive environment. If you have that at training it becomes second nature and you don't just turn up for a fight on a Saturday as you are turning up for a scrap every day of the week.

"Celtic are in a fantastic position domestically and they aren't really getting time to enjoy winning the games as they are far too busy thinking about the next match. So far Ange Postecoglou's men are dealing with the games exceptionally well as they have come along.

"They are in that mode of concentrating solely on winning every game between now and the end of the season and that is what the Celtic manager and the players are thinking and it is what they will certainly be trying to achieve."