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Alisson was involved in a collision(Image: Buda Mendes/Getty Images)

Liverpool are facing being without another key player after Alisson was involved a nasty clash of heads for Brazil.

The goalkeeper, 32, collided with Colombia centre-back Davinson Sanchez during the nations' World Cup qualifying match on Thursday.

Both Alisson, who remained conscious, and former Tottenham star Sanchez had to be subbed off in the 78th minute, with Brazil going on to win 2-1.



Now Alisson - who didn't play in the final as cup goalkeeper Caoimhin Kelleher was preferred - has joined them on the sidelines, although Brazil's team doctor has left the door open to him facing Argentina on Tuesday.

Doctor Rodrigo Lasmar confirmed after the match: "Alisson suffered a head injury.

First, we will perform a CT scan, followed by a diffusion MRI.

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"If all the tests are negative and normal, we will then perform a cognitive test, and then we will evaluate the player.

If everything is normal, we will conduct a series of observation tests over the next few days to see whether or not he would be able to travel with us and go to Argentina for our next game."

Lasmar also said: "Today, the first step is to perform the necessary tests and assessments and monitor the player over the next few days, which is the protocol.

He is completely normal now, without any complaints.

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