Watford striker Grzegorz Rasiak has been ruled out for around a month with a groin injury.
The Poland international was carried off on a stretcher during the win over Nottingham Forest last week and missed the 2-2 draw with Sheffield Wednesday at the weekend.
Manager Brendan Rodgers said: "He actually tore his abductor, which is a tissue injury and needs time to heal and is part of the recovery process."
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