Romero insists there'll be stronger for a first season with the Australian.
"Ange has a winning mentality and has totally changed the direction of the club. When he arrived, he brought everyone together and we all have the same mental attitude and approach, we all share the same ambition to be successful and win things at this club and that is the key," said the Argentine World Cup winner.
"We play in an entertaining style and we’re all very happy with the way the manager sets us up and plays. Of course, we’ve had ups and downs this season, a lot has happened. Let’s not forget, we have a young squad with players playing their first season in the Premier League - it’s not easy playing in this league.
"You don’t just settle in over two or three months, it’s tough, but it’s been a decent first season with this top manager, some inconsistencies, but overall good. I know we couldn’t quite keep the pace up to be battling for the league title, but now we need to try to keep growing and improve in order to be travelling in the proper direction. We must come back stronger next season. The young players will benefit from this first season of experience, and we’ll perform better. Next season is going to be a big one for us."