Zarate, a January signing from Fiorentina, twisted his knee awkwardly towards the end of the first half.
2016 SeasonAll times ET
Mauro Zarate was Watford's star man against West Ham, but he now faces an extended period on the sidelines through injury.
Slaven Bilic was left with "mixed emotions" after West Ham came from behind to rescue a 1-1 draw at Watford.
Andre Ayew came off the bench to rescue a point for 10-man West Ham in a 1-1 draw at Watford.
Slaven Bilic could use Troy Deeney's dig at West Ham to inspire them to gain revenge over Watford.
Leicester are in real trouble ahead of Liverpool's visit this weekend. Elsewhere, the first silverware of the season is up for grabs.
How's this for an agonising choice. Your team win the Premier League -- next season you are relegated. Do you take the deal?
Watford boss Walter Mazzarri said Saturday's loss to Manchester United was a "pity" after a strong start at Old Trafford.
Anthony Martial's man of the match display vindicated Jose Mourinho's choice to start him for the first time since Jan. 15 as Man United beat Watford.
Anthony Martial scored on his return to the Manchester United lineup as they moved to within a point of Manchester City with victory over Watford.
Anthony Martial has been named in the Manchester United starting lineup for Saturday's game against Watford.
Watford head coach Walter Mazzarri is eager to keep Tom Cleverley at Vicarage Road beyond the end of the season.
While their title hopes have faded, there's plenty to play for when Liverpool host Tottenham. Predict all the Premier League games in our match polls.
Troy Deeney has criticised Aaron Ramsey for turning his back on a free kick he deflected into his own net against Watford, saying he "bottled it."
Who is the best purchase in your club's history and who flopped the most? ESPN FC asked our club bloggers for their tops and flops in the market.
Odion Ighalo has told ESPN FC he would "love" to return to the Premier League in the future after completing a move from Watford to Changchun Yatai.
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