"Of course people in football find it hard to understand that Tottenham didn't sign or sell players, but sometimes in football you need to behave differently".
"What the club is doing is showing that it is so fearless because building a new training ground, finishing the (player) lodge this summer is a massive investment".
But Pochettino believes the club have acted on his demand in a different way.
Tottenham have become the first team in Premier League history not to make a summer signing since the transfer window's inception in 2003.
"We believe a lot in our players and why not repeat a similar season like previous year or the season before, and with more experience?" That is true, don't believe in £400m, that is the truth.
Spurs, who have yet to make a new signing this summer, have been interested in a move for Grealish for several months but only recently made Villa an offer.
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"I don't feel the panic in football".
He added: "Of course maybe in the mind of everyone they will say, "Oh Tottenham didn't sign", but to sign for the sake of signing?"
Thursday's deadline passed without Spurs signing any new players, either permanently or on loan, so coach Mauricio Pochettino will open the club's new stadium with the same squad that finished third in the Premier League in May. "Some people make a drama in football and drama for me is another thing", Pochettino added. "It's a fearless decision".
"Football is a game where you need to be clever in how you set your principles, your strategy to try to win the games".
But he urged them to knuckle down if they remain for the season, saying: "If all the players today are thinking in a collective target, we can be competitive".
The Scotland worldwide was a key man during a loan spell at Villa Park last season, but as the Villans hit financial difficulty early this summer, they were unable to put anything in place that allowed them to keep the playmaker.