The best facial hair in sport: Olympiakos midfielder Paulo Machado likened to Borat during victory over Manchester United

Machado came on as a substitute, but it was not his performance that attracted attention

Paulo Machado pictured warming up for Olympiakos (GETTY IMAGES)

While most of the talk has focused on Manchester United's hapless display in Greece, one Olympiakos player did manage to cause a bit of stir himself, at least on social media.

It was not Alejandro Dominguez, scorer of Olympiakos' first goal. Nor was it Joel Campbell, the on-loan Arsenal striker who doubled their advantage. It was in fact a second half substitute by the name of Paulo Machado.

Who, you ask? If you watched last night's game, you'll remember him as the man with the most fantastic moustache in football.

Likened to Borat and Freddy Mercury, the sight of the central midfielder was perhaps the only thing that may have managed to raise a smile from Manchester United fans.

You can check it out, plus some other brilliant beards and moustaches seen in sport over the years, below...

Roy Keane, who has sported facial hair himself in the past, must have been impressed, even if not much else dazzled him in the 2-0 Champions League defeat for Manchester United.

Former Sky Sports presenter Richard Keys was among those to razor glass to Machado on Twitter...

Machado is tackled by Nemanja Vidic (GETTY IMAGES)

Aside from growing a perfect moustache, Machado has six caps for Portugal and has had spells at Porto and Toulouse before joining Olympiakos in the summer of 2012.