The Toffees played out a 1-1 draw with the Hornets away from home at Vicarage Road in the Premier League.
James McCarthy nicked the ball from Miguel Britos to coolly finish in first-half injury time for the Toffees, but the home team found the equaliser through a Jose Holebas headed effort just moments later.
Deulofeu has taken to Twitter to make it clear to the fans that the Everton players will continue to fight this season.
Over the course of the 90 minutes at Vicarage Road, hosts Watford had 42% of the possession, took 13 shots of which five were on target, and earned seven corners.
Visitors Everton had 58% of the possession, took 12 shots of which seven were on target, and earned six corners.
Roberto Martinez’s side will return to action on Wednesday evening when they take on Crystal Palace away from home at Selhurst Park in the Premier League.