Watford matchwinner Tom Cleverley was floating after victory over Arsenal.
The 29-year-old former Manchester United midfielder scored his first goal in 18 months to send the Hornets into the top four of the Premier League.
"The manager told us play with a bit more belief at half-time and that's what we did," Cleverley said.
"Troy [Deeney] came on and made a huge difference.
"We're building something here, the team spirit, the last minute goals and we'll go to Chelsea with massive confidence."