Borussia Dortmund has insisted that they will not sell the Gabonese star Pierre-Emerick Aubameyang to Bayern Munich and will only consider offers from Barcelona or Real Madrid. African footballer of year Aubameyang has scored 32 goals and claimed five assists in just 36 games in all competitions this season, which has not gone unnoticed by rival clubs.Also, Read; Real Madrid set to bid for Chelsea star N'Golo KanteChampion league quarterfinalist Dortmund has seen a lot of their players move to Bayern in the recent past, with Mario Gotze (now back with Dortmund), Robert Lewandowski and Mats Hummels all players who switched from Dortmund to Munich. But Dortmund general manager Hans-Joachim Watzke claims that the 27-year-old would only be allowed to move to Real Madrid or Barcelona."I think he will stay with us," Watzke told Sport1. "But if Real Madrid or Barcelona come with a big offer, then we have to discuss it. We will not sell him to the Bavarians."Pierre-Emerick Aubameyang has been the best player at the club for the past three seasons. Since his move to Dortmund from French side Saint-Etienne in 2013, Aubameyang has netted 112 goals in just 179 games for the German side.