Despite agreeing the basic framework of a move for Gyökeres weeks ago, Arsenal and Sporting found themselves butting heads over the nature of the add-ons proposed by the Gunners, which invited pressure of a potential hijack from long-term admirers Manchester United.

Arsenal have not been shy in backing Mikel Arteta in the transfer market and the potential signing of Viktor Gyokeres would take his spend to more than £800m - but he believes he needs more