Hernandez got on the scoresheet as Leeds registered a 3-1 triumph over the Championship promotion favourites at Elland Road on Sunday afternoon.
The Spaniard has hinted that no-one should get carried away by the success, but the playmaker insists that the team's performance would have impressed their biggest rivals.
The 33-year-old is quoted by the Yorkshire Evening Post as saying: "When the other teams see this game, every team will think it is not easy to beat us or to win against Leeds United. We played good but it's impossible to play good every game.
"With this attitude and spirit, if one game we can't play good then we still have the chance to win the game with this work and everybody running and working and helping their team mates. This is the way."
Leeds are next in action when they face Derby County at Pride Park on Saturday evening.