Arsenal have been strongly linked with a move for Celtic left-back Kieran Tierney, with The Sun reporting that the Gunners have submitted two bids already.
The Scottish Premiership giants have already knocked back a £15 million bid from the North Londoners as they are holding out for £25 million.
Arsenal have returned with another £17.5 million bid, but it remains to be seen if Celtic will agree to a deal.
Manager Unai Emery wants to reinforce his squad and has a left-back on his radar, and he sees Tierney as an upgrade on Nacho Monreal and Sead Kolasinac.