Spurs became the first Premier League club to NOT sign a player before the summer deadline since the transfer window came in 15 years ago.
But Pochettino, 46, admitted he is happy with the current squad ahead of their move into their new stadium next month.
And he pointed to Britain’s decision to leave the single market as one of the reasons why there is less value out there and less temptation to buy new players.
Poch said: "Building a stadium that is nearly £1billion.
"That is true, don't believe in £400million, that is the truth.
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"And then with Brexit it is worse because the cost is 30 per cent more, and then keep the best players.
"For me [that] is to be brave. Of course maybe in the mind of everyone they will say 'Oh Tottenham didn't sign' — but to sign for the sake of signing?"
Spurs face Newcastle in the 12.30pm kick off on Saturday and will play their second game of the season at Wembley against Fulham.
They then face more games on the road against Manchester United and Watford, before welcoming Liverpool to their new home on September 15.
Pochettino added: "What the club is doing is showing it is so brave.
"Building a new training ground, finishing this summer the lodge was a massive investment.
"You need to respect all the opinions but of course we are a club that our decision was not to sign, (even though) it is the fashion to sign or because we are the only club in Europe that has not signed players.
"That maybe looks bad because of the perception and because of the history of football.
"But that is our decision – to keep the best players and to keep the squad. It's a brave decision."
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