Watford striker Mauro Zarate has suffered a serous knee injury.
Zarate has revealed he suffered an anterior cruciate ligament injury against West Ham on Saturday.
On Sunday the 29-year-old revealed the extent of the damage in an Instagram post.
He wrote: "With sadness I inform you that the results show the following: anterior cruciate ligament rupture plus an injury grade 1 of medial collateral ligament.
"I will face this with all my strength and will be back stronger than before."
Source: tribalfootball.com