'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'.
Despite no new arrivals for the first season at their brand new stadium, Pochettino feels they can still go on to do great things this term.
Grealish, whose future has been the subject of intense speculation for the whole summer, trained at Villa's Bodymoor Heath training ground on Thursday morning and club insiders are now confident he won't be sold before the 5pm transfer deadline.
"I think we have a very competitive squad, of course that we are hoping to improve, but if you can not improve the most important thing is trying to keep your best team, your best players". What the club is doing, is showing, it is so fearless.
Speaking about any possible incomings, the Tottenham manager said in a press conference: "I think it's so hard now".
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"Building a stadium that is almost £1bn". And then with Brexit it is worse because the cost is 30 per cent more.
"You need to give your best to the position the manager says".
If Spurs decide not to cash in, they must attempt to try and get Alderweireld to commit to a new deal. If we have all the squad thinking as individuals rather than as a collective game, you can not achieve what you want and can not succeed.
Deals for players like Danny Rose, Toby Alderweireld and Mousa Dembélé are yet to materialise however and Pochettino said he expected the players who remained at the club following the close of the window to knuckle down. "That is the key this season".
But Pochettino believes all three are at risk of losing focus and has urged them to forget about their futures and contribute to Tottenham's season instead.