With the Westfalenstadion clock ticking to minute 82 and the score 7-1, all Celtic players were in Dortmund's half when the ball was turned over.

This led to the tireless home side getting away with ease again, but only Schmeichel's foot prevented an eighth goal.

Actions like these fuel criticism of the naivety that will greet Rodgers.

The Celtic coach's two spells have included a 0-7 defeat at Barcelona, ​​a 0-5 home defeat against Paris St-Germain, another 7-1 away in France and six defeats at Atlético Madrid in the last season.

The Celtic manager is the only coach to have seen his team concede seven goals in a Champions League game more than once. Tuesday was the third occasion.

And with a trip to last year's Europa League winners Atalanta next up, the Scottish champions risk finding themselves in trouble again against another dynamic side that thrives on their man-to-man approach.

“Atalanta will be a completely different test,” said former Scotland striker James McFadden on Sportsound.

“They are so aggressive in their pressing that they will be relentless. Celtic need to be so much better.”

Former Celtic goalkeeper Pat Bonner added: “If you look at how Celtic play in the league, they will try to win the ball high up the pitch. This mentality is in the players. Tonight it showed that they can’t do that against top teams.

“These teams can take four or five players out of the game with two or three passes, then attack the back four.”

“You have to come up with a different plan or structure to stay in the game.”