Borussia Dortmund midfielder Pascal Gross is excited to play his first Champions League game at the cavernous Signal Iduna Park on Tuesday and thinks the club’s famously noisy fans can again help them against Celtic. Dortmund were flattered by a 3-0 win at Club Brugge in their opener before a 5-1 Bundesliga defeat to Stuttgart. But a rollercoaster 4-2 home victory over Bochum on Friday, where they were 2-0 down, showed Gross the power of the so-called Yellow Wall at the former Westfalenstadion. “It will be very special for me. The fans have carried us in the last few home games – that’s honest…