(Reuters) - Under-pressure Borussia Dortmund manager Nuri Sahin said he remained optimistic ahead of his side's Champions League clash at lowly Bologna on Tuesday despite their poor Bundesliga form.

Dortmund lost 2-0 to Eintracht Frankfurt on Friday, marking their third consecutive defeat in the Bundesliga, where they sit 10th with 25 points, seven points off the top four and a massive 20 adrift of leaders Bayern Munich.