The Gunners are set to accelerate their pursuit of Club Brugge attacker Christos Tzolis following the departure of Trossard.
BBC Sport reported the Gunners’ interest in the Greece international in June and the club are now poised to move for the forward.
Club Brugge are anticipating an offer from Arsenal for Tzolis.
Sporting director Andrea Berta is working on the deal after his assistant Maurizio Micheli watched the 24-year-old play for Greece against Sweden last month.
Tzolis could be available for about £30m (35m euros).
Any move for him would be separate to Arsenal’s interest in signing more high-profile attackers this summer.
They retain a long-term interest in Atletico Madrid’s Julian Alvarez, who is the club’s priority target, but it remains to be seen if a deal for the Argentina international is possible this summer with Barcelona and Real Madrid also interested.
Morgan Rogers is Arsenal’s preferred option in their search for a versatile forward, with the club’s efforts to sign the Aston Villa attacker set to accelerate once his participation at the World Cup with England is over.
Paris St-Germain winger Bradley Barcola is viewed as the alternative in the event of failing to reach an agreement with Aston Villa, who reportedly value Rogers at £130m.
Meanwhile, Arsenal recruitment specialist Micheli watched Georgia Under-21 international Andria Bartishvili play for Iberia 1999 against Flora in their Champions League qualifier last Wednesday, with sources indicating the Gunners are stepping up their efforts to land the teenage attacker.