That is according to Sky Sports pundit and former Arsenal striker Charlie Nicholas.
Watford have had a stunning start to the season, sitting eighth in the table after 13 games.
They have already beaten Arsenal 2-1 at home this term and come into tonight’s match off the back of a convincing 3-0 win away to Newcastle on Saturday.
So good has their start been that Everton tried and failed to approach manager Marco Silva about their vacant post.
Nicholas oversaw their impressive win at St James’ Park on Sky’s Soccer Saturday programme.
He believes they can catch Manchester United out on the break, because Jose Mourinho’s side will be going all out for the win.
“I did Watford at the weekend against Newcastle, they were absolutely fabulous,” Nicholas said.
“They could have won seven.
“They were so good and they will play this like an away game.
“I think whoever plays for Manchester United will be bombing forward because they need to win to keep the pressure on Man City.
“I’m going to go for a surprise tonight. I think Marco Silva is really doing the business for this team.
“I’m going to go for a shock, it’s 2-1 Watford.”