Karius was at fault for two of Real Madrid's goals when Liverpool were beaten 3-1 in May's Champions League final, after which it was revealed the 25-year-old German was suffering from concussion.
Following the game against Dortmund, forward Salah wrote on Twitter: "Stay strong Karius, it has happened to the best of players".
"To those who take joy in seeing other people fail or suffer, I feel for you".
'Whatever it is thats (sic) happening in your life to hold that much anger and hate, I pray that it passes and good things come to you'. It is of course the most negative thing about the day.
"I know Christian, I liked him since he was a kid".
Cohen recording of pay-off talk broadcast on US TV
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"We will see, but we can not say anymore it now".
The 25-year-old Karius returned for pre-season training at Liverpool under vast scrutiny after two glaring errors in May's 3-1 Champions League final defeat by Real Madrid.
Klopp has been protective of Karius but confirmed he will be replaced as Liverpool's first-choice goalkeeper next week when Alisson joins up with the squad at a training camp in France.
Jurgen Klopp says Joel Matip possibly suffered a "small tear" in his leg during Liverpool's match with Borussia Dortmund on Sunday, but admitted he was unsure of the severity of the injury.
Iranian state media say Trump's tweet 'passive'
Donald Trump has warned Iranian President Hassan Rouhani that he will face dire consequences for threatening the United States. Israeli Prime Minister Benjamin Netanyahu opens the weekly cabinet meeting at his Jerusalem office on Monday, July 23, 2018.
Klopp, speaking ahead of his side's pre-season friendly with Dortmund on Sunday, said as quoted by the Mirror: "He has a contract at Dortmund".
He made his return to action in Liverpool's friendly against Bury on July 14 and subsequently played in a game at Blackburn.
However, Pulisic entering the game at half-time would prove to be the key factor in the result, the 19-year-old winning and converting a penalty to level the scores just after the hour mark.
Virgil van Dijk's header had given the Reds a first half lead in a match where they were in control for so long, before Pulisic's second-half intervention - two goals and an assist - turned the tide.
Liverpool continue their ICC campaign with matches against Manchester City on Wednesday and Manchester United on Saturday.
USA and European Union agree to work towards lower trade barriers
The two leaders did not specifically mention vehicle tariffs in their statements, keeping the focus on other industrial products. Add Donald Trump as an interest to stay up to date on the latest Donald Trump news, video, and analysis from ABC News.