Victor Lindelof has left Sweden's international squad, but the reason for his departure remains a mystery.
The Manchester United star's national team described it as "personal, personal reasons" but, the sudden departure comes with a friendly against Estonia scheduled for Wednesday.
Lindelof had played the entire 90 minutes in each of the World Cup qualification victories over Georgia and Kosovo
However, Sweden's assistant manager Peter Wettergren announced that Lindelof would return to Manchester on Monday night, but did not say whether or not the defender was injured.
“He will leave us tonight for private, personal reasons,” Wettergren said during a press conference on Monday.
Lindelof recently revealed that he has been battling a back injury for months and has been doing his utmost to manage the situation.
“I’ve been struggling a bit with my back. I’ve been having it for the last couple of months,” he said earlier this month.
“I missed a few games as well and I am just trying to manage it in a good way. I missed a few games and I came back slowly.
“I played one game and then I got to rest again, it felt a bit better.
“It started to come back a little bit but I’m just trying to manage it in a good way, do the recovery right, and then treatment. [I’m] just trying to manage it in a good way.”