Aylsham's Sam Blair joined Norwich at Under-10s. He broke into the Under-18s during 2017/18 playing against Aston Villa on 3rd February 2018 and retaining his place for the game against Southampton the following week.

He has also had a call up in April 2017, to train with England at the National Football Centre, St Georges Park, where he also met England Manager, Gareth Southgate. He is now in contention for squad selection, for upcoming Under 15 national games.

He signed an Academy Scholarship with Norwich in July 2019.

On 14th January 2021 he signed a professional contract that will extend his time with Norwich until 2023. He had eatured for City in their FA Youth Cup third round fixture against Wolverhampton Wanderers in December, the ‘keeper playing his part in seeing the Canaries through to the fourth round after a 4-2 win over Wolves. His solid performances in goal have earnt the shot-stopper spots on the bench for David Wright’s Under-23s side, most notably in the Papa John’s Trophy, in which he was on the bench against Plymouth Argyle and Cheltenham Town’s senior sides. He said "“It’s a very proud moment for me and my family, obviously it’s been a long journey up until here, hopefully it can go on for a lot longer! I’m just very pleased to be here."

He said “I came up here for the U10s season and then I took a break away from football, I didn’t enjoy the pressure as a young kid in training and games.I quit for about nine months, slowly got back into it and spoke to Colin Watts [Youth development officer], I got back in with a few trials and then started as an U11. I got my scholarship and now I’m here today!”

He was called up to the Republic of Ireland Under-21 squad in March 2021 and was on the bench for their clash with Wales on 26th March 2021. His father's family are from County Tipperary. He was named on the bench for four friendlies but is yet to earn his first cap

On 9th July 2021 it was reported that Blair would be joining Bury Town on loan, following in the footsteps of Dan Barden and Joe Rose.

On 16th September 2022 he was loaned to Wroxham on a short-term basis. The following month he was loaned to Kings Lynn Town on a youth loan until January 2023. He played four times for the Linnets.

On 31st May 2023 Norwich's Academy announched that they would not be renewing his contract when it expired on 30th June 2023. During June, he was seen training with Notts County whose goalkeeping coach Tom Weal is known to Blair.

At the end of February 2024 it was reported that Blair had signed for Icelandic Premier Division side KR Reykjavik following a successful trial.