The Croatian scored either side of half-time to give his side a dream start to the Premier League season at Craven Cottage.
"With the win, 5-0 at home, it was a spectacular game for us and the fans," he told BBC Sport. "We defended very well, they just had one or two chances, and we scored five goals so it was clear we were good on the offensive.
"It was a great feeling for me today. It was my first game and I'm very happy."
Fulham continue the new campaign with a trip to Manchester United next Saturday.