Jürgen Klopp must make at least one change to Liverpool’s starting line-up when Watford visit Anfield.
A muscular injury means Dejan Lovren is unavailable for Saturday’s Premier League contest, with Klopp telling the media: “He is out, muscle this time - more serious than last time.
“We don’t have a timeframe.”
With Joel Matip (knee) and Fabinho (ankle) also sidelined, the Reds currently have just two senior centre-back options: Joe Gomez and Virgil van Dijk.
“It’s a concern, how you can imagine,” said the boss.