Arsenal have signed four players and are close to wrapping up deals for Cristhian Mosquera and Viktor Gyokeres, but their spending spree may not be done there.

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.