Borussia Dortmund coach Niko Kovac urged his team to raise their level when they host Barcelona on Tuesday in a Champions League quarter-final return leg, where they will be looking to overturn a 4-0 deficit. Former Dortmund striker Robert Lewandowski scored twice as the German side were thrashed by Barcelona last week in their first leg to all but end their Champions League run. Dortmund, Champions League finalists in 2024, face a tall order to qualify for the semi-finals with a win over