The Liverpool defender is set to see a specialist again amid fears he could be ruled out for a number of weeks with an ankle injury.
Moreno suffered a tendon problem making a block during the Reds’ 7-0 win over Spartak Moscow on Wednesday night and will not be fit to face Everton on Sunday.
The Spanish full-back has already been assessed by a specialist but needs further checks.
Kop boss Jurgen Klopp said: “We need to have further assessment. So far it could be everything.
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Liverpool's likely line-up to face Everton at home
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“The specialists aren’t sure; not tomorrow, but if it’s in a week or so or a little bit longer so we have to wait for that”
Jurgen Klopp on Alberto Moreno
“I cannot say much about it. It’s a very rare thing.
“So far the specialists aren’t sure; not tomorrow, but if it’s in a week or so or a little bit longer so we have to wait for that. There’s a little damage around the tendons.”
Klopp was speaking ahead of Sunday’s clash with neighbours Everton but the topic of Philippe Coutinho was raised again.
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Barcelona are still keen on the Brazil ace who refused to commit himself to the club beyond the January transfer window after he bagged a hat-trick in the demolition of Spartak on Wednesday.
But Klopp said: “I have no reason to think about it. I've said it a few times we have not spoken about transfers in this moment.
“Whatever I can say can stop your questions and I did think 'Don't answer it' because it is a waste of time.
“But if I don't say anything it is enough to speculate and say 'Ah, he doesn't say that because of that'. No-one who has influence on it came to me so far and said 'Phil will be away in January'.
“I am completely fine with the situation. We had this big story in the summer and I have no desire to have it again from now until the end of January because we play around 20 games in this period.
“I try to say nothing about that and then on January 31 we can shake hands and say what a wonderful time we had together, the journalists and me.”