Liverpool and Chelsea played out one of the most unfriendly friendly matches in recent memory this morning as part of the International Champions Cup.
No less than six players picked up yellow cards, whilst Cesc Fabregas was shown red for a reckless tackle late on.
Fortunately, his 'victim', Ragnar Klavan, appears to have avoided any serious repercussions. The same can't be said, however, for fellow Anfield teammate Marko Grujic who was also on the receiving end of a poorly timed challenge from a Chelsea man.
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Grujic was involved in a nasty clash of heads with Chelsea's Bertrand Traore in the first half of Thursday morning's game (seen below) and he was unable to continue beyond half time.
Now, speaking after Liverpool's 1-0 defeat, Jurgen Klopp has provided a rather worrying update after admitting he is unable to confirm just how serious the issue is.
"The biggest problem for me in this moment is that Marko Grujic is in hospital, because he can't remember anything," Klopp told the gathered media, via Sky Sports. "That's not too cool.
"Hopefully it's not too serious but of course a young boy in this situation is not too cool.
"Injuries after games like this in pre-season is the biggest problem obviously."
Klopp's description of Grujic's status certainly sounds like the 20-year-old has suffered a pretty serious concussion and, as he noted, it is far from an ideal situation as the team continues preparations for the new season.
In other sports, such a concussion would rule a player out for a number of weeks. However, football has often been criticised for how they handle such issues so it will be interesting to see how much Grujic is involved in the rest of Liverpool's pre-season.
Hopefully, while he may struggle to remember the impact from Toure, he will make a good recovery and be ready for the opening day of the Premier League campaign in a few weeks time.
There was at least more positive news for the other members of the Liverpool squad on the treatment table.
Klopp doesn't believe Klavan sustained any lasting damage from Fabregas' rash challenge, whilst fellow defender Joel Matip will be ready for the start of the new season, despite missing today's game with an ankle issue.
"I expect him to start the season," Klopp said on the free transfer signing.
"But for this, he has to train a little bit more. The first two-and-a-half weeks were really good, he became better and better and then he was out."