Celtic have rejected a £15m bid from Arsenal for defender Kieran Tierney, Sky Sports News understands.
As reported elsewhere, Arsenal's initial offer for the left-back was turned down by the Scottish Premiership champions and the Gunners are expected to come back with an improved offer.
Serie A side Napoli are also interested in a deal for the Scotland international.
Tierney was hampered by a hernia problem last season and is currently recovering from surgery.
The 22-year-old was restricted to 21 league appearances for Celtic last term.
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