Borussia Dortmund have signed Brazilian full back Yan Couto on loan from Manchester City while Germany striker Niclas Füllkrug has left the training camp ahead of what appears to be a move to West Ham United. Dortmund said that Couto has started training at their pre-season camp in Switzerland. The Champions League runners-up said that the deal will become permanent in 2025 if certain sporting criteria are met. Couto, 22, played at Spanish club Girona in the past two seasons. He has four Brazil caps and won the under-17 World Cup in 2019. “Yan Couto is a very exciting player. He gets up and do…