World Cup winner Mats Hummels is rightly regarded as one of the best central defenders in Europe, but he is going through a tough moment at present.
He used his Twitter feed to hit out at his critics yesterday, describing their verdicts on his weekend performance as 'exaggerated', and 'unbelievable.'
Hummels had scored an own goal as Borussia Dortmund lost 3-1 to Hamburg, and failed to record a single tackle.
German newspaper BILD are reporting Hummels is feeling over-burdened at Dortmund, and needs a period of rest and self-reflection. One course of action Dortmund may take is to leave him behind for this week's Europa League trip to Russian side Krasnodar.
Where Liverpool fit in
One man: Jurgen Klopp. Dortmund expressed confidence Klopp would not come in for their top talents after he was appointed as Liverpool boss [via The Mirror], but signing Hummels is too good an opportunity to turn down.
The German international is a major improvement on Liverpool's current central defensive options, even when they are all fit.
Dortmund will be looking to make a statement signing next summer, and luring Hummels away would be just that.
SkySports reported in March that Hummels was considering a move abroad, amid interest from Manchester United.
He went onto state his desire to remain at Dortmund, but Klopp's appointment at Liverpool throws up a whole new scenario for Hummels to consider should the Reds make an approach.
It was under Klopp that Hummels established himself at Dortmund, and became one of the world's most renowned defenders.
If his current malaise continues, he is only more likely to consider his options, and Liverpool's hopes would improve of bringing in the leader their defence so badly need.