Arsenal are yet to table a third offer for Kieran Tierney, but Celtic manager Neil Lennon admits he is drawing up a contingency plan at Parkhead.
Two approaches from the Gunners for a Scotland international left-back have been rebuffed, with the most recent of those coming in at £25 million ($31m).
Celtic have made it clear that they will not be dropping their valuation or be pressured into parting with a prized asset.
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Arsenal are yet to test that resolve again, with Lennon claiming there is no update to offer when it comes to the 22-year-old defender.