Arsenal remain locked in negotiations with Celtic over a deal for Kieran Tierney after failing with another bid for the defender.
Tierney is a key target for the Gunners in the current transfer window as Unai Emery looks to strengthen his squad for the new season.
As Standard Sport reported last month Arsenal have already failed with two offers for the left-back, with the first of those around £15million and the second closer to £18m.
Arsenal returned over the past few days with a renewed bid, believed to be around the £25m mark, but that has been turned down by Celtic.
The offer was understood to be compromised of several add-on payments which made the final figure of £25m, but Celtic want more money upfront.
Arsenal are being forced to try and complete deals using instalments due to their modest transfer budget of around £40m and that is proving problematic.
