It was a sobering evening for Celtic in the Champions League as they suffered a 7-1 defeat to Borussia Dortmund on Tuesday.

Brendan Rodgers’ side had never won on German soil in 14 attempts, and last year’s UCL runners up put on a ruthless display at the Signal Iduna Park with Celtic trailing 5-1 at half time.

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Peter Schmeichel – who lifted European football’s ultimate prize with Manchester United in 1999 – has shared the advice he gave to his son, Kasper, as he made his way to the dressing room after “a bad day at the office”.

He told CBS Sports: "It really is difficult because you always want the best for your children. It doesn't matter what situation they find themselves in, and of course today was just one of those days that you can never, ever explain.

"There were so many shots at goal. Seven of them went in and it could have been a little bit more. As Callum McGregor said to me earlier, it was just one of those days and they couldn't get close enough to close that down.

"I spoke to Kasper as he came out of the game here and their dressing room is just there. I spoke to him and said this was a bad, bad day at the office and take it as nothing more. Move on, be one of the leaders in the dressing room and help everybody else recover from this.

"Because up until this point, don't forget, Celtic have played really, really good football and there is so much optimism at the club. Obviously, they need to go through what happened and all that, but this was just a really, really bad day in the office."