Valverde's side are 3-0 up ahead of Tuesday's return at Anfield after Lionel Messi put the Reds to the sword at Camp Nou last week, but previous year Barca crashed out despite holding a three-goal advantage.
"Precaution? No, it's a concussion, which means he is not allowed to play". He feels ok, but it is not enough...
"I am among the elite of football, I am at Barcelona, thanks to what Liverpool made me as a player".
The German confirmed that both players would be out in a press conference on Monday, saying that the decision had been taken on medical grounds and was out of his control.
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As well as the loss of Salah, fellow striker Roberto Firmino will also miss the match through injury.
"It looks you have to be ideal to beat (Barcelona) and we should try that", Klopp said, adding his players could "fail in the most attractive way". There's still that sense of belief but we know it's going to be hard.
"Two of the world's best strikers are not available tomorrow and we have to score four goals to go through in 90 minutes". If not, these are the last two home games of an incredible season.
"We know he has a short fuse and can lose it if he is pushed to the limits, so play him at his own game and try and get him rattled".
"Liverpool gave me a lot to make me better".
"If we can do it, wonderful, and if not then fail in the most handsome way, if you want, with a close result".
Klopp hoped the season would not end in double disappointment: "Together with our supporters this was a long season and there's a little chance to make it even longer".