Manchester United have had to step up their bid to sign Pierre-Emerick Aubameyang from Borussia Dortmund after several of Europe's biggest clubs have shown interest in the striker.
The Red Devils have been monitoring Aubameyang for almost two years and have stepped up their interest in recent months as the 26-year-old enjoys the most productive season of his career.
Aubameyang has scored 37 goals in 45 games in all competitions so far this season.