Mauricio Pochettino says Tottenham are at a crossroads and insists it will be impossible to continue overachieving in the manner they have.
Spurs are on course for a fourth-successive top-four Premier League finish and are in the Champions League semi-finals - all done against the backdrop of their £1billion stadium being built, a crippling injury list and no signings in the last two transfer windows.
Pochettino had said the completion of the club's stadium represents the closing of a five-year chapter, but he does not know what comes next, only that it will be tough carrying on in the same way.
"I think we're going to have time to talk," he said ahead of today's clash at Bournemouth. "Now we're so focused on trying to finish the season. But if you ask me if we can repeat next season, I cannot guess.
"I said to you all that when we finish the season I think it's a moment to close a five-year chapter, to analyse, to talk a lot and to give the real value of that period. It was amazing.
"The problem is, what do we want for the next chapter of the club? Now we've finished the training ground, finished the stadium.
"What does the club want to achieve in the next one, two, three, four or five years and what are the fans going to expect from the club?
"There's many things to talk about and put on the table, and then try to be realistic.
"We cannot live like we have in the last five years - on the perception side and reality side.
"We achieved a lot of things. We overachieved, maybe. I don't know.
"Because of our ambition, the way that we work and many things we can praise, we're here now in a very good position. But what next?"
If Pochettino had his way that would mean heavy investment in the squad as, with strikers Harry Kane and Son Heung-min missing from Tuesday's Champions League semi-final first leg defeat by Ajax, he was unable to name any attacking players on the bench.
And he has called on Spurs to "behave like a big club".
"I cannot guess what will happen because it's a club decision," he added.
"One question I was asked the other day was if 'the depth of the squad is not at the quality of the new stadium'. If we start next season talking about that, nothing good is going to happen in the future.
"The perception and feeling are not going to be right. We cannot tell our fans negative things. We must always be positive.
"But sometimes if it's too positive, we create an expectation that's not the reality.
"And, maybe, I'm bored of talking about that. But that's the reality. 'We need to fight for big things, behave like a big club and do things properly."