Loris Karius seems to have had enough at Liverpool.It's been an incredibly tough couple of months for the German, whose two mistakes against Real Madrid in the Champions League final proved so costly.Since then he's made school-boy errors in friendlies with Chester, Tranmere Rovers and most recently Borussia Dortmund, where he was arguably at fault for two goals.In the aftermath of the Dortmund game and following some online abuse from football fans, Karius took to Instagram with a passionate statement."To those who take joy in seeing other people fail or suffer, I feel for you," he wrote."Whatever it is that's happening in your life to hold this much anger and hate, I pray that it passes and good things come to you."Matters got even worse for Karius last week when Alisson completed a £66m move to Liverpool from AS Roma.

KARIUS' LIVERPOOL NIGHTMARE

Jurgen Klopp has since confirmed Alisson will be the Reds' No.1 goalkeeper for the 2018/19 season, meaning Karius will be demoted to No.2.

Karius is now considering his future on Merseyside, but he's at least received some support from one of football's greatest ever goalkeepers - Iker Casillas.

In response to the scrutiny, Casillas ordered football fans to leave Karius alone and to understand that he's only human.

"Will this attack [on Loris Karius] ever end?" tweeted the Real Madrid legend on Sunday. "I'm talking about him like so many other goalkeepers.

"There are many more serious problems in the world f***! Leave the kid alone! He's also a person. As we all are!"

Casillas deserves huge respect for coming out and defending Karius and now he's gone one better by posting a video on Twitter of the worst mistakes he's made throughout his career.

Clearly the Spaniard wants to show people - and Karius - that even the best goalkeepers make fools of themselves and no one is perfect.

What a hero. Karius needs a pick-me-up right now and he will surely be relieved to see that someone like Casillas has been through struggles.

A move away from Liverpool may well be on the cards for the 25-year-old, but he's young enough and talented enough to rediscover his form and salvage his career.