Liverpool are sweating on the extent of Alisson’s injury against Norwich City.
The Brazilian goalkeeper damaged his calf while taking a goal kick during the first half of Friday’s opening Premier League win over the Canaries.
Alisson had to be helped off the pitch after the setback and was replaced by summer signing Adrian, who played the remaining 50 minutes of the game.
The European champions are already expecting to be without the influential stopper for next Wednesday’s Super Cup showdown with Chelsea in Istanbul.
However Jurgen Klopp is facing a potential selection headache in the event of Alisson’s injury proving longer term than the midweek trip to Turkey.
Adrian is currently Liverpool’s only available goalkeeper with academy prospects Caoimhin Kelleher and Vitezslav Jaros both suffering injuries this summer.
“There is nothing negative to say about the game except for Ali’s injury,” said Klopp.
“That is not good for us, but we have to see how serious it is and then we have to deal with it.
“It is the calf. He couldn’t carry on and that is not a good sign. He will not play on Wednesday, I can say that already with all my experience.
“(Is it) a tear? Maybe but you cannot say that without the scan.
“He is injured for sure. We have to see how much.”
He added: “Kelleher broke his hand and is back in training but is not 100%. Varos had an elbow injury. We are a bit short.
“Adrian is a very confident guy. He didn’t want to sit only on the bench for the next couple of years.
“He made himself ready but in a situation like this you want someone who has played the league, is ready, a calm guy good with his feet which is really important for us.
“But we don’t want a situation where one goalie is fit.”
Liverpool previously enlisted the services of veteran goalkeeper Andy Lonergan to help with their pre-season tour of the United Status earlier this summer.
Should Alisson’s injury extend beyond the Super Cup, the Reds may consider drafting in a free agent in order to plug that squad dearth.