Klopp said: "I don't want to give anything away and I want to wait. How can I say it is not possible?"
Salah played in four Premier League games in March and in those four games, he notched six goals and he also had an assist. "Everybody thinks he'll be ready for Tuesday but at the end we will see", he said.
"If he is a doubt, he will not be involved. If they are not 100%, they can not be involved".
"Maybe the problem is me and it's just the way it is with the amount of good footballers there are there".
"It's so unusual", said Klopp.
The news will come as a real blow to Klopp as he'll already be without Jordan Henderson against City due to suspension while Adam Lallana has been ruled out for a couple of weeks with a hamstring injury.
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No players or staff were injured but two police officers were hurt.
"You cannot do it like this because you have no clue, anything can happen overnight", he said.
Klopp has a raft of injuries to contend with ahead of the short trip to Everton for the 231st Merseyside derby.
One star linked with a move to the Spanish capital is Salah, who is enjoying an incredible year for the Reds.
Salah netted his 38th goal of the season as the Reds beat Manchester City 3-0 in the Champions League on Wednesday, although the Egyptian was forced from the field in the second half with a suspected groin injury.