This season was a breakthrough one for Kieran Tierney at Celtic.
The 18-year-old made his senior debut in April of last year and became a regular under Ronny Deila. He sporadically started games under the Norwegian but really established himself as Celtic's first choice left-back in late January.
Apart from winning two Scottish Premiership titles, the real legacy of Deila's time at Celtic will be the development of younger players. Just at the weekend, he brought on Jack Aitchison to become Celtic's youngest ever player. Just two minutes on the pitch, the 16-year-old made history by also becoming the club's youngest ever goal scorer.
In 35 starts for Tierney this season, he managed a notable six assists. His form caught the attention of Gordon Strachan who gave him his first senior international cap in a friendly against Denmark back in March.
He went on to be named the Scottish PFA's Young Player of the Year.
Strachan is not the only one whose attention has been grabbed by Tierney - several Premier League clubs have also been impressed by his progress with Man City, Liverpool and Arsenal all interested.
It is Arsenal who are reportedly the most keen on the player.
According to the Daily Record, Arsene Wenger is preparing a bid of £10 million for Tierney.
Arsenal's current left back options include Nacho Monreal and Kieran Gibbs, with the former being first choice this season. The Spaniard is 30 however and Gibbs' form has taken a slide over the past year.
Tierney has been watched by Arsenal's chief scout Steve Rawley with his opinion on the player's potential being strong enough to warrant a bid.
In August, Tierney was given a four-year deal by Celtic. Such has been his development, the club reportedly hope to fend off interest from other clubs by handing him an improved five-year contract.