There can't have been too many players to have played for both Glasgow Celtic and Bayern Munich, so when the European giant starts tracking one of Celtic's stars - it shows how good Kieran Tierney has been.
The 19-year-old left-back has been one of Celtic's best players, and clubs across Europe have been put on alert. Bayern scouts were reportedly at Celtic's 3-3 draw with Man City during the week, and while Moussa Dembele caught the eye - it was Tierney's chance to play against quality opposition that brought the Germans to Glasgow.
Tierney acquitted himself well in the face of Raheem Sterling, and adds to the growing speculation around the defender. Tierney's name isn't a new one around the Premier League, and as far back as March - Arsenal were tracking his progress.
We'll see what happens to the one-cap Scottish international, and should he move to the Bundesliga - he would be just the ninth Scottish player to play in the league, and would join 19-year-old Scottish international who joined RP Leipzig for a fee of £13 million last summer.