It was goals galore in Dortmund as Celtic were punished on matchday two of the UEFA Champions League. 

Borussia Dortmund triumphed emphatic 7-1 winners at Signal Iduna Park - with two of the strikes coming from the penalty spot. 

There were a few refereeing decisions that could be discussed from the clash, although much like the result, the choices of Jose Sanchez and his fellow officials were pretty straight-forward and the tie went by without any controversial moments on a sobering night for the Scottish giants. 

First penalty kick 

Celtic 'keeper Kasper Schmeichel rushed out his box and took out Dortmund forward Jamie Gittens within just six minutes. The spot-kick was converted by captain Emre Can and gave the hosts an early lead. 

The decision to award a penalty wasn't really contested from those in Hoops. While Schmeichel was rightfully handed a yellow card for his role. Perhaps in time gone by it might've been red for preventing a goal scoring opportunity. 

Daizen Maeda goal 

Celtic responded to going behind very quickly through their Japanese winger - and there was a brief VAR check to ensure he didn't help the ball in with his arm. 

It was just a very quick look from the officials before the goal was awarded. 

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Pascal Gross yellow 

Neil Lennon dubbed it "borderline" on TNT Sports commentary - and you could see why some in Celtic colours would want a red to be shown. 

The former Brighton player appeared to stand on Arne Engels' foot while challenging for the ball. 

Second penalty kick

Again, there were few complaints when Engels clipped Karim Adeyemi inside the box and a penalty was given. 

That avoidable collision meant there was a long way back for Celtic, with Guirassy converting to make it 4-1. It was soft but in this day and age, contact in that vicinity is always going to be penalised. 

Reo Hatate booking 

The half-time Celtic substitute received a pretty standard yellow card for sliding in on a Dortmund player with around 15 minutes to play. It was another needless challenge and it really just summed up both his and the team's night. Particularly since he had just powered the ball over the bar moments earlier.