Picture credit: @thesun.co.uk Puma sponsored Dortmund are set to fine Gabon international Pierre-Emerick Aubameyang £43k for wearing Nike mask after netting his 24th league goal of the season against Schalke over the weekend.The 2015 CAF player of the year promoted sportswear giants' Nike 'The Masked Finisher' campaign despite playing for Puma-sponsored Dortmund.Dortmund CEO Hans-Joachim Watzke in an interview with Bild said: “This behaviour is unworthy of a big corporation. It can’t be that we have to force through the economic interest of Nike in this way. Our partner is Puma.” Watzke said as quoted on SunSports Puma, who supply the German club’s kit AND are a shareholder in Dortmund, released a statement: “We are surprised that a competitor puts a player in such a situation.” The 27 year old striker has previously celebrated by wearing a Spiderman and Batman mask in the past. His latest charade – after netting his 24th Bundesliga goal of the season – earned him a yellow card.After his humility came into question, the former St-Etienne striker has defended his actions on Instagram saying: "Me arrogant? Come on guys, this is the way I live!"This is my world, I'm like a kid who enjoys to play football. Sad about the result but we keep going. #Maskedfinisher"Dortmund manager Thomas Tuchel admitted he knew Pierre-Emerick Aubameyang was planning something but did not know exactly what. Tuchel who believes Aubameyang is an extrovert but very sensitive insists it would be the worst thing to curb his character, reckoning the Gabonese is reasonable enough to accept punishment and move on.