Borussia Dortmund don’t need a squad overhaul after what has so far been a mixed season but the main aim is still to secure qualification for the next Champions League, CEO Hans-Joachim Watzke has said. “I don’t think we’ll be making any major changes,” Watzke told streaming portal DAZN ahead of Dortmund’s Champions League last 16 return leg against PSV Eindhoven later on Wednesday. “There are always a few ideas that come to mind, but it’s not a major shake-up.” Watzke said that “we don’t have to revamp everything” because Dortmund have a lot of young talent in the likes of goalkeeper Gregor K…