West Ham United boss David Moyes has praised Watford ahead of the Premier League meeting between the clubs on Saturday afternoon.
However, Moyes has suggested that the Hornets should not be judged on their blip, and has backed Gracia to make an immediate impact at Vicarage Road.
At a press conference, the 54-year-old told reporters: "I think Watford have always been a decent team. Look at the start of the season, the opening three months they were right up there. They had a middle spell where they didn't do as well but they've always been seen as a good side.
"The new manager will be having an impact. I know Javi from Malaga, and I am sure he will. Sometimes, football clubs can change but Watford have had a few managers over the years, they'll know if it works for their club."
Watford currently hold a three-point advantage over the Hammers in the top-flight standings.