Pierre-Emerick Aubameyang has checked in at Dortmund Airport ahead of his move to Arsenal.
The Gunners have agreed a £60m deal to bring Aubameyang in, with the Gabon striker offered a £180,000-a-week deal.
Aubameyang was pictured arriving at the airport at midday on Tuesday before catching a flight to London, where he landed around 2pm.
He will thrash out personal terms and undergo a medical but Arsenal are expecting negotiations to drag into the final day of the window.
Dortmund will not sanction the deal until they have a replacement.
Dortmund's No1 target now is Michy Batshuayi but Chelsea will not let him go unless they get Olivier Giroud from Arsenal.
Arsenal do not want to do business with a direct rival but may be forced into doing a deal to get the Aubameyang transfer over the line.
Dortmund have until February 2 to complete a deal for his replacement with the German window open until Friday.
Arsenal fans have been growing increasingly excited about Aubameyang's arrival with the striker seen as a replacement for Alexis Sanchez, who joined Manchester United earlier this month.