Borussia Dortmund coach Nuri Sahin has warned his players to step up their efforts or face the consequences in the wake of a 4-0 defeat against Thailand’s top flight club Pathum United. “Who doesn’t do the basics won’t play, it is as simple as that,” Sahin said. Sahin spoke of a heavy defeat in the pre-season match and said he would address all issues in an open and honest way. He was especially unhappy with his team’s defending but excluded the young players from his criticism. Dortmund arrived in sweltering Bangkok on Saturday and played the match on Sunday, with Sahin also making 10 changes…