The right-back has signed a deal until the summer of 2022 after making a first-team breakthrough earlier in the season.

The 19-year-old made seven first-team appearances earlier in the season - including going up against Neymar in a Champions League clash with Paris St Germain - and is now back in training following an injury lay-off.

Anthony Ralston applauds the Celtic fans at the end of the Champions League match against PSG in September. Picture: SNS Group

Ralston told the Celtic website: “It’s a great feeling to sign with the club I’ve been with since I’ve been young. This is where I want to be and I want to start playing more games. I’ve enjoyed getting a taste of it and I’m looking forward to the future.

“It’s great, with the length of the contract, to have that out the way and I can focus on the football side of things. It’s a great feeling and I’m delighted.”

Ralston made his Celtic debut in a defeat by St Johnstone in May 2016 which immediately preceded their record-breaking 69-game unbeaten domestic run.

The Scotland youth international featured twice last season before a run of games in August and September was cut short by a knee injury.

He said: “There are so many ups and downs that come with being a footballer. I’ve enjoyed the experiences I’ve had up to now. With the injury, it’s just one of these things that happen and it’s how you come back from it.

“But it’s been a good start for me in my career and signing the contract now, I’m just looking forward to getting on with my football over the next few years.”

Anthony Ralston signs new deal keeping him at Celtic until 2022