"We're working hard trying to improve the squad," Pochettino told reporters.
"The market has only started to move very quickly after the World Cup. Be sure that we are going to do some movement but like always, we're working hard - no rash decisions.
"I'm not worried, I'm happy preparing the team to arrive in the best condition for the first Premier League game."
Tottenham, who will play AS Roma in the pre-season International Champions Cup later on Wednesday, face Newcastle United in their league opener on Aug. 11, two days after the transfer window closes.
(Reporting by Aditi Prakash in Bengaluru; Editing by Peter Rutherford)
