Mamadou Sakho is on his way home from Liverpool's pre-season tour of America with mixed reports as to why.
The Liverpool Echo say questions have been raised about his poor attitude while others say he has simply aggravated his Achilles injury and is heading back to Melwood for specialist treatment.
That injury is already set to rule him out of the start of the Premier League season so he was not due to play a part in the friendly fixtures against Chelsea and AC Milan anyway.
However, Klopp's decision was apparently taken without consulting the medical staff, conjuring up speculation that they may have had a falling out.
Until we get some firm answers from the German coach, we can only speculate. So speculate we will.
It may be worth noting that Klopp dropped a hint that he was annoyed with the French centre-back several days ago. The Liverpool team were taking a tour of the famed island prison Alcatraz and Sakho came prepared with a selfie stick and a GoPro camera.
At one point, he interrupted an official interview with LFCTV, leading Klopp to claim that they were only on the prison to leave Sakho behind. Haha, very funny. But interestingly, Klopp revealed that Sakho had indeed turned up late for Liverpool's flight out to San Francisco.
Fast forward to 2:30 to see the curious exchange
Sakho asked Klopp how long he thought he could live on the famous island, to which he responded: "I don't have to think about it. You should think about it because only one of us came late last night for departure in Liverpool.
"It was not me, it was you by the way. We are here because we want to leave Mama here."
It is another setback for Sakho after missing the end of last season and Euro 2016. He failed a drugs test and was handed a provisional ban while an investigation was held. Sakho escaped a much longer ban from UEFA for taking an alleged fat-burning substance but appears to have done so on a legal technicality rather than his name being cleared.
Concerns over his attitude are also not new. He clashed with former manager Brendan Rodgers over a similar issue and also left Paris Saint-Germain in semi-acrimonious circumstances.
Klopp, it appears, is going to take a hardline approach with the enthusiastic defender and appears to have no problem putting first-team stars up for sale. Jordan Ibe has already left while Christian Benteke is also up for sale.