Tottenham “achieved their objective” and did a “great job” by keeping their best player in the transfer window, says manager Mauricio Pochettino.
Pochettino and striker Harry Kane signed new long-term deals this summer.
“I am not worried, I am not sad – I am so happy,” said Pochettino, whose side were the only Premier League team not to add to their squad.
But the Tottenham Supporters’ Trust said they want “a full and credible explanation of what has happened”.
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.
“Our targets are always in the same level of Real Madrid or Manchester United or Manchester City, but for different circumstances we cannot achieve that.
“If you cannot add players who can improve your squad, the most important thing is to make sure you do not lose your best player.
“And I think that was a great job from the club to keep the best player and keep the manager.”
Tottenham made a £25m bid for Aston Villa midfielder Jack Grealish, but were unable to conclude a deal.