Spurs became the first Premier League club to not make a summer signing since the current transfer window system was adopted in 2003.
Pochettino could still lose players to overseas clubs as the deadlines for Europe’s other majors leagues are later in August.
But the Argentine said: “We have a very good squad, we have very good players and it is not easy to add players that improve that.
“Of course we didn’t sell players and with 25 players in the squad it’s difficult to add.
Tottenham made a £25m bid for Aston Villa midfielder Jack Grealish, but were unable to conclude a deal.
Despite Pochettino’s positivity on the eve of a new season in which Tottenham will play in their revamped stadium, the club’s supporters want answers from chairman Daniel Levy.