Borussia Dortmund coach Nuri Sahin believes Dinamo Zagreb pose a serious threat in Wednesday's Champions League clash, noting their impressive turnaround after starting with a heavy loss to Bayern Munich. Dortmund are in the top section of the Champions League table after three wins, while the Croatian capital club are currently in the play-off section, with seven points from four matches. Dinamo's most memorable outing came in the form of a 9-2 thrashing by Bayern on the opening matchday.