Arsenal are under pressure to get a deal for Kieran Tierney wrapped up.
The Gunners have failed with two bids for the Celtic left-back so far and could now face heavy competition from north London rivalsTottenham.
Spurs want to offload Danny Rose this summer. Mauricio Pochettino is set to leave the England international out of their tour squad, which means Tierney is becoming an increasing priority.
BBC Sport report Celtic are reluctant to sell, feeling Arsenal have undervalued him so far.
Tottenham’s interest could start a bidding war, which would go down nicely at Celtic Park.
Celtic boss Neil Lennon said yesterday he regards Tierney as better than Aaron Wan-Bissaka, who has just been sold for £50 million, The Mirror report.
While designed to drive up his price, it also indicates Celtic are preparing for a sale.
Unai Emery does have Sead Kolasinac and Nacho Monreal to call upon this season.