The Hornets were beaten by a Kevin Phillips penalty in extra-time at Wembley, denying them the chance to qualify for England's top flight, but former Chelsea ace Zola insists the club will be a stronger proposition next season.
"It is tough for me and for everyone connected to Watford, It wasn't our best game but to lose in extra time to a penalty is hard to take," Zola told Sky Sports.
"Everything we achieved this season, to be here playing was a big bonus for us, it was unexpected but we did it because it was deserved it.
"We are determined to be stronger next year. We will be stronger next year."