Aubameyang bagged a hat - trick in Dortmund 's 4 - 0 Champions League win over Benfica on Wednesday .
Liverpool would likely need to secure qualification for Europe 's top competition should they want to sign the 27 - year - old .
Aubameyang bagged a hat - trick in Dortmund 's 4 - 0 Champions League win over Benfica on Wednesday , and Liverpool would likely need to secure qualification for Europe 's top competition should they want to sign the 27 - year - old .