The Hornets beat Crystal Palace 2-1 at home on Saturday afternoon, booking their ticket to Wembley for a final four clash against Wolves.
"Everyone was obviously very happy to get through to Wembley," he said.
"But the boys' feet are firmly on the ground. There's a lot of football still to be played this season, so we're buzzing, but there was no throwing champagne around and stuff like that.
"Everyone knows we've got to train hard and we've got big games coming up.
"Today was a real team effort and we're enjoying every game and we're just delighted to go through."
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