Chalkias, though, hit back at Varandas' criticism, stating: "If (Hugo) Viana were still at Sporting, the deal would have been done within an hour. Everything was written but we didn't have time to start a legal battle. I don't understand how a player who scored so many goals and won three trophies didn't deserve more respect.
"The industry is about trusting people. The sacrifices we made were probably the turning point in getting the deal done. They offered him to Real Madrid, made headlines with Madrid and even United, but from day one there was a commitment to Arsenal."
Gyokeres has made an indifferent start to life at Arsenal having scored just three league goals in his opening seven appearance for the Gunners, two of which came in a resounding home win over Leeds back in August.
Arsenal return to action after the international break against Fulham on Saturday, October 18th, while Manchester United face a huge clash at Anfield against bitter rivals and defending Premier League champions Liverpool.