Arsenal regularly have scouts at big matches across Europe.
But Goal claim this scouting trip suggest Arsenal are targeting one of their Premier League rivals' players.
Although there is no indication as to which player was being watched, the report suggests Arsene Wenger would have been targeting a defender.
Arsenal boss Arsene Wenger reportedly sent a scout to Chelsea's clash with Man City
And that means it would have been either Chelsea's Kurt Zouma or City's Vincent Kompany.
Zouma's future at Stamford Bridge is in doubt, with the centre-back struggling to force his way into the first XI since returning form injury.
Meanwhile Kompany has struggled for fitness at City this season and his days at the Etihad appear to be numbered.
Arsenal line-up predicted to face Crystal Palace
Fri, April 7, 2017
Express Sport predicts who will start for Arsenal in their clash with Crystal Palace at Selhurst Park on Monday (8pm)
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Who will Arsene Wenger pick in his Arsenal starting XI against Crystal Palace?
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Chelsea defender Kurt Zouma in action against Man City
Wenger has already revealed he plans to add to his squad this summer.
"It [the squad] is a very strong basis," the Frenchman said.
"But the team needs to be strengthened, of course."