Though there reportedly remains a debate ongoing over the nature and structure of the bonuses included, Mikel Arteta was hoping to have Gyokeres signed in time for Saturday’s departure for their pre-season tour of Asia, along with Chelsea winger Noni Madueke and Valencia centre-back Cristhian Mosquera.

Madueke missed Chelsea's 3-0 victory over Paris Saint-Germain in the Club World Cup final to complete his transfer to the Gunners, and the 23-year-old departs Stamford Bridge having amassed 20 goals and nine assists from 92 matches for the Blues in all tournaments.

Viktor Gyokeres is expected to join Arsenal this summer and Sporting Lisbon fans have made their feelings clear on the move by displaying banners during a pre-season friendly against Celtic