Hopefully Breel Embolo has worked it out by now.
The Switzerland striker was in a crowd with his team-mates when Ricardo Rodriguez snuck up on him and delivered a slap to the back of his head.
The Wolfsburg left-back then craftily snuck around to the opposite side of the pack, while Embolo was clearly trying to figure out who delivered the blow.
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Breel, if you are still none the wiser, check Instagram...
