West Bromwich Albion could potentially move ahead of Watford with all three points from their Premier League clash at the Hawthorns on Saturday.
The Baggies, down in 12th, started their season with two wins but have not won in the last four, drawing two and losing three, most recently a 2-0 defeat at Arsenal after a narrow 2-1 loss to Manchester City, in a difficult run of fixtures.
While Watford, in sixth, have beaten Bournemouth, Southampton and Swansea City 2-1 last time out, two losses and two draws, sees them just three points clear of their opponents this weekend, after six games.
Ahead of the tie, West Brom head coach Tony Pulis talked up his opposite number, who has been hard at work improving a side he inherited.
He said: "[Watford head coach] Marco Silva has a better horse to ride this year than last year.
"He's been backed – they've spent quite a bit of money. They look a very capable team. It will be a tough game."
Silva, meanwhile, revealed he has done his homework on West Brom and their manager.
He said: "We are expecting a tough game, everybody knows when West Brom plays at home, that will be the same for everybody.
"They are strong in specific moments of the match, like at set pieces, and are a really assertive team.
"We have started to build something important in our dressing room. The commitment I have felt and seen until now is really important."
In team news, West Brom wingers Nacer Chadli and Oliver Burke aren't fit enough to play this weekend but Gareth McAuley faces a late fitness test.
Nathaniel Chalobah is out ahead of surgery on a knee injury but defender Miguel Britos is back after his three-match ban, for Watford.
Sebastian Prödl, Younès Kaboul and Craig Cathcart remain long-term absentees.