Tottenham chairman Daniel Levy said he had no regrets over the hiring of Ange Postecoglou as he defended the decision to sack the Australian as manager.
Postecoglou guided Spurs to their first trophy for 17 years by winning the Europa League last month.
However, that was not enough to save his job after finishing 17th in the Premier League.
The decision to dismiss the former Celtic boss and appoint Thomas Frank has been met with a backlash from many among the Tottenham fan base.
But Levy outlined his ambition for Spurs to be Premier League and Champions League winners some day.
"I don't regret appointing Ange, I'm very grateful to Ange. In his first season we finished fifth and in his second we were over the moon to win a trophy," Levy told the club's in-house media.
"But we need to compete in all competitions, and we felt that we needed a change.
"Emotionally it was difficult but we feel that we've made the right decision for the club."
Tottenham have not won the English top flight since 1961 and have never won the Champions League.
"We've won a European trophy, but it's not enough," Levy added.
"It's what we haven't done that is more important. We need to win the league. We want to win the Premier League. We want to win the Champions League. We want to win."
Levy has held his position at Tottenham for more than 25 years with Frank becoming the 13th permanent manager in that time.
"Whenever you have a new coach, it's always a fresh start. (There are) always have different ideas but we want to build on the success of winning a trophy last season," he said.
"One of the things that stood out to me with Thomas was that he is clearly highly intelligent, a great communicator, super human being plus all the technical aspects which are obviously important."