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Watford won't be intimidated by Sunday's trip to Old Trafford having already beaten Manchester United once this season. The Hornets won 2-0 at Vicarage Road back in December, but Nigel Pearson's team is still not free from the threat of relegation from the Premier League.
Just one point separates Watford from safety, while United are three short in the race for the top four and a guaranteed place in next season's UEFA Champions League.
The Red Devils boosted their qualification hopes with a 2-0 win away to Chelsea last time out and could welcome midfield terrier Scott McTominay back into the squad following injury.