Pierre-Emerick Aubameyang's repeated tardiness is a problem for Borussia Dortmund, the club's sporting director Michael Zorc has admitted. Aubameyang is Dortmund's star turn, with 31 Bundesliga goals last season and 13 in 15 games so far this term, writes the Press Association. He was, however, suspended for a match last month for "disciplinary reasons," and Zorc revealed his poor time-keeping was an issue club bosses were struggling to resolve. "Auba is a special player...he is extravagant and a colourful character. That does a city like Dortmund a lot of good,'' Zorc was quoted by Sport Bild as telling Sky programe 'Wontorra-Talk.' "We have only one problem with him - that is punctuality. We have to be very clear about that."