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Mats Hummels is a good friend of Jurgen Klopp's - having won two Bundesligas together at Borussia Dortmund.

He would have been at Klopp's 50th birthday celebrations this summer apart from the fact it clashed with his own wedding anniversary.

But the two men did get the chance to catch up this week - as Klopp's Liverpool took on Hummels and his Bayern Munich team-mates in the Audi Cup.

Sadly for the 28-year-old centre-back, it's probably an evening he'd wish to forget as a pace-laden Liverpool attack ran riot and the Reds recorded a 3-0 victory over the hosts in the Allianz Arena.

It's been a tough pre-season for Bayern and they finished rock bottom in the Audi Cup after also losing 2-0 to Napoli on Wednesday, a result which saw the team treated to boos from their own fans.

Hummels felt that was unfair, due to the much-changed line-up against the Italians, but admitted the boos should probably have come after the display against the Reds.

"We made it far too easy for Liverpool, and it was the worst game that I had ever experienced at Bayern," said Hummels, who joined Bayern last summer, after the second defeat.

"Looking at who was on the pitch (against Napoli), they (the boos) were badly timed.

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"Let's put it this way - perhaps it's taken them 20 hours and they were still upset after yesterday. We have to accept that.

"Sometimes it's good to get a shot across the bows -- but we've had two or three and that's enough now, otherwise it'll be a really difficult August."

Bayern have now lost five of their six pre-season games and take on Dortmund in the German Super Cup this weekend.