Arsenal has agreed upon a £55.5 million ($78.1 million) transfer with Borussia Dortmund for Pierre-Emerick Aubameyang.

The deal is contingent on Dortmund finding a replacement before the end of the transfer window.

Aubameyang will sign a three-year deal worth £180,000-a-week.

Anthony Modeste, who joined the Chinese Super League club Tianjin Quanjian from Cologne last summer, has been mooted as a potential addition, but would cost around €30m(£26.4m).