Arsenal will need to pay well in excess of £50m to sign Borussia Dortmund striker Pierre-Emerick Aubameyang, sources close to the German club say.
On Friday, Dortmund sporting director Michael Zorc called Arsenal boss Arsene Wenger "disrespectful" for talking publicly about the player.
Wenger has said the Gabon international would "fit in" at Arsenal.
But the clubs are now in talks over a deal would breach Arsenal's record £46.5m move for Alexandre Lacazette.