Arsenal have been very active in the transfer market this summer as Mikel Arteta looks to strengthen his squad ahead of the new season, having finished second for the third year in a row

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.