Celtic defender Kieran Tierney admits he is flattered by extensive interest in him but has reiterated that he could remain at the Parkhead club for life.

The 20-year-old signed a five year extension to his contract earlier this season but it has not dampened the recurrent speculation about his long-term ambitions in the game.

Spanish side Atletico Madrid will scout the Scotland internationalist on Saturday afternoon in the William Hill Scottish Cup final and they are latest in a long line of clubs who have kept tabs on the progress of the player.

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"I've never thought about elsewhere yet, in my life," he said. "It's just been Celtic since the age of seven."

Tierney captained Scotland in a friendly this season and has been a mainstay at the club since breaking into the first-team in 2015 under former Celtic manager Ronny Deila.

He was an integral part of the Invincibles last season under Brendan Rodgers and so far and has won both the PFA Scotland and Scottish Football Writers’ award for an unprecedented three consecutive seasons.

"I've never even been on trial with another team," said Tierney. "I was at my local boys' club then moved to Celtic at seven.

"Can I see myself being here all my career? Yes, I can. But, you never know in football.

"I've never thought about being away from Celtic. Maybe one day it will happen."

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And the player regards the interest as flattering rather than unsettling.

"It's a kind of confidence-booster in a way to know that you've put the hard work in and massive teams all over Europe are noticing it," he said. “It's flattering for teams like that to be interested."

Tierney's rival for the left-back berth for Scotland is Liverpool’s Andy Robertson, who is due to cap an excellent debut season at Anfield with a Champions League final appearance against Real Madrid on 26 May.

"Celtic getting to a Champions League final is obviously unlikely because of the money involved," said Tierney.

"But I'm not jealous of Andy Robertson at all. What he's done is brilliant for him. He deserves to be there. He's a great player, a player for me to look up to in the national team."