Arsenal and Manchester City are reportedly closely monitoring Celtic teenager Kieran Tierney.
The 19-year-old, who has also been linked with Bayern Munich, was part of the Celtic team that drew 3-3 with Man City in the Champions League last week.
According to The Sun, Arsenal had scouts in attendance in Scotland, while the full-back's performance caught the attention of Man City boss Pep Guardiola, who is said to be still in the market for new defenders.
Tierney, who came through the youth system at Celtic, has made 50 appearances for the Scottish champions, including 15 in all competitions this season.
