Liverpool rocked by Skrtel blow
The Slovakian centre-back was injured in Thursday night's 3-1 victory over Romanians Unirea Urziceni, which helped the Reds reach the last 16 of the Europa League.
Benitez feared the worst and x-rays at the club's Melwood training ground have confirmed he has fractured a metatarsal in his right foot.
"We were really disappointed after the game because it was a good result but then we had the bad news about Martin," said the Liverpool manager.
"He's had x-rays and they confirmed he has a broken metatarsal.
"We have to check over the next couple of days how long it will take to recover."
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