Nuri Sahin’s side beat the Bhoys by a massive 7-1 margin, leaving Brendan Rodgers’ outfit bruised and embarrassed after projecting so much hope in the build-up.

Preventable individual errors contributed to the heavy defeat. Sloppy passing and poor positioning allowed Dortmund to rip through the Scottish champions repeatedly.

It was difficult for supporters, players, and staff to take.

After the match, captain Callum McGregor’s disappointment was clear. He didn’t shy away from Celtic’s failings, admitting his side were ‘rattled’ on the pitch.

The midfielder told TNT Sports: “A sore one, for sure. We were punished with every mistake we made. Before we knew it, we were 5-1 down. A sobering night.

“If you make mistakes like that, you get punished. Credit to Dortmund. We’ve been sobered a little, but we need to take that and bounce back in the next game.

“You get yourself back into the game. The quick goal killed us and rattled us a little bit. When you give good players time on the ball, they will kill you. And that’s what they did.

The midfielder told TNT Sports: “A sore one, for sure. We were punished with every mistake we made. Before we knew it, we were 5-1 down. A sobering night.

“If you make mistakes like that, you get punished. Credit to Dortmund. We’ve been sobered a little, but we need to take that and bounce back in the next game.

“You get yourself back into the game. The quick goal killed us and rattled us a little bit. When you give good players time on the ball, they will kill you. And that’s what they did.

The midfielder told TNT Sports: “A sore one, for sure. We were punished with every mistake we made. Before we knew it, we were 5-1 down. A sobering night.

“If you make mistakes like that, you get punished. Credit to Dortmund. We’ve been sobered a little, but we need to take that and bounce back in the next game.

“You get yourself back into the game. The quick goal killed us and rattled us a little bit. When you give good players time on the ball, they will kill you. And that’s what they did.

The midfielder told TNT Sports: “A sore one, for sure. We were punished with every mistake we made. Before we knew it, we were 5-1 down. A sobering night.

“If you make mistakes like that, you get punished. Credit to Dortmund. We’ve been sobered a little, but we need to take that and bounce back in the next game.

“You get yourself back into the game. The quick goal killed us and rattled us a little bit. When you give good players time on the ball, they will kill you. And that’s what they did.

The midfielder told TNT Sports: “A sore one, for sure. We were punished with every mistake we made. Before we knew it, we were 5-1 down. A sobering night.

“If you make mistakes like that, you get punished. Credit to Dortmund. We’ve been sobered a little, but we need to take that and bounce back in the next game.

“You get yourself back into the game. The quick goal killed us and rattled us a little bit. When you give good players time on the ball, they will kill you. And that’s what they did.

The midfielder told TNT Sports: “A sore one, for sure. We were punished with every mistake we made. Before we knew it, we were 5-1 down. A sobering night.

“If you make mistakes like that, you get punished. Credit to Dortmund. We’ve been sobered a little, but we need to take that and bounce back in the next game.

“You get yourself back into the game. The quick goal killed us and rattled us a little bit. When you give good players time on the ball, they will kill you. And that’s what they did.