Celtic faces Borussia Dortmund in the Champions League, aiming for a historic win as they have never beaten a German team in this competition. The Scottish side has a poor record against German clubs, with only one draw in six encounters and a total of two goals scored. Meanwhile, Dortmund, despite recent struggles, is expected to field a strong lineup, with key players returning from injury, although they have shown defensive vulnerabilities. Brendan Rodgers, Celtic's manager, acknowledges the challenge ahead, describing the match as an 'acid test' for his team. Both clubs won their opening matches, making this clash the only one among first-round victors. The game is crucial for Celtic, who seeks to improve their European standing against a historically tough opponent.