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.
The Scotland global 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.
"The club made a massive effort to try and extend contracts of Harry Kane, just one example".
"It is so hard now, only four hours to the end [of the transfer window]", he said.
Pochettino added: "We have a very good squad, with very good players and it is very hard to add players to that". "Always, until you finish the game, you can not say "now it's the end of the game". The Championship side are prepared to dig their heels until the closing of the Premier League transfer window at 5pm on Thursday.
"It is hard to understand for people in football that Tottenham didn't sign or didn't sell players - but sometimes in football, you need to behave different".
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"I am happy to keep all the squad together".
"The club is doing an incredible effort to try to finish the stadium as soon as possible, and the lodge finished at the training ground".
"It is better to keep our squad all together, we believe a lot in our players".
"We believe a lot in our players and there's no point now to say 'why not repeat a similar season like past year or the season before, and with more experience?'" That is a fantastic experience for him to translate to our team. I'm sure we're going to be competitive. Indeed, Rose is talking to European clubs including Schalke about a loan move.
Chairman Daniel Levy has proved his point by refusing to sell to Belgian to another Premier League side, but Spurs still have the option to sell him overseas.
In all he featured for the club on 43 occasions, finding the net seven times, and playing a part in assisting a number of other strikes. "We work to improve the squad, but when it is not possible, it is not possible and we move on".