Celtic have rejected a £15m bid from Arsenal for defender Kieran Tierney, Sky Sports News understands. 1:54 Charlie Nicholas says Arsenal must buy at least three defenders during the transfer windowThe 22-year-old was restricted to 21 league appearances for Celtic last term. Tierney, who has made 12 appearances for Scotland, is contracted to Celtic until the summer of 2023. Follow the Summer Transfer Window on Sky SportsAs well as keeping an eye on Sky Sports News, make sure you don't miss a thing with our dedicated Transfer Centre blog. There's also the return of the Transfer Talk Podcast, the daily UK, Regional and European Paper Talk, plus features across skysports.com and the Sky Sports app.

Source: Sky sports June 23, 2019 14:30 UTC