Arsenal must break Celtic's transfer record to sign Kieran Tierney.

The Bhoys want at least £25m for the fullback, who can also operate at centre-back, according to the London Evening Standard.

That amount would exceed the £19m that Lyon paid for Moussa Dembele to leave Parkhead last summer.

The Gunners have already failed with bids of £15m and £19m for the 22-year-old.

With a measly budget of £45m, it is unclear where Arsenal will follow through with their interest in the Celtic academy graduate.