Pochettino highlighted the cost of Tottenham's new stadium, which will open this season, arguing that while it is a big investment, Brexit made it more expensive than the figures let on.
Spurs are yet to sign or sell any senior players, and the Premier League transfer window closes at 5 p.m. BST.
Pochettino's rallying cry at the end of last season calling on the club to be "brave" and "take risks" has not been seen in the transfer market.
Mauricio Pochettino didn't manage to bring in any new signings this summer but the Tottenham manager expressed his delight at keeping his squad together with no key players leaving. "We hope he's still our player by Friday", Villa manager Steve Bruce told BBC West Midlands earlier this week.
Mauricio Pochettino says Tottenham have shown bravery by declining to sign any players this summer and focusing instead on retaining their top stars at a time when the club is investing heavily in their infrastructure.
"I am the boss and if I expect you to do something then you need to provide it".
"I am not anxious, not sad, I am so happy". I think it is clear what is going on and how we are going to move in the future.
The 46-year-old is refusing to panic about the lack of arrivals and insists he is happy with the direction the club is heading in.
"Of course it's hard to understand for people that Tottenham didn't sign or sell players, but sometimes in football you need to behave differently".
"That maybe looks bad because of the perception and history of football but that is our decision - to keep the best players and to keep the squad".
"There's no reason to not trust in our squad and no reason not to believe in our club or believe in what we can do. We all know the situation".