Jose Mourinho admits Tottenham are not going to be "in the same world" as some clubs in the transfer market this summer.
Mourinho says he will be able to do "little important things" but that they will not be able to compete with the likes of Chelsea and Manchester United.
Chelsea confirmed their second signing for next season yesterday with the £50m-plus addition of prolific RB Leipzig striker Timo Werner, joining Hakim Ziyech, who has signed from Ajax.
Spurs spent over £100m last year, before the coronavirus pandemic, and Mourinho knows he will not get the same luxury.
He says he is happy to accept the challenge that presents as long as he can strengthen where he feels necessary.
"We know that we are not going to be in the same league, in the same world, as clubs that are going to do completely different to us," he said. "You have examples already of clubs investing and making important movements in the market and we are still nine matches away from the end of the season.
"But I think we are always going to be very balanced which is what Tottenham normally is.
"Would I expect us not to do anything and to stay exactly with the same squad that we have in this moment? My answer is no.
"I expect us to do some little important things and if we do our little important things and we improve in two, three positions that we need to improve, I am completely open to the challenge, I am completely supportive to the board, to the owners.
"And let's go for it. But in this moment I am not even thinking about that because I am focused on these nine matches.
"It's obvious that there are a certain level of options that are not for us. We have to admit that. But that's a normal situation.
"So United bought Bruno Fernandes, Chelsea are buying Ziyech and Werner, they can do what they want. It's not our problem. We focus on ourselves."
Mourinho's men resume their Premier League season against Manchester United tonight, seemingly with a second chance at European qualification given injured players are back.
But Dele Alli will be missing as he is serving a one-match suspension due to a social media post he made about coronavirus in February. It was ill-judged, but quickly deleted, and Mourinho says the crime paled into insignificance compared to some lockdown breaches.
The Portuguese himself broke rules when he was spotted with Tanguy Ndombele, while Manchester City's Kyle Walker produced several high-profile misdemeanours and Aston Villa's Jack Grealish has been charged by West Midlands Police for driving without due care and attention after attending a lockdown party.
"Lots of people made mistakes during this lockdown period," he said. "I am one of the examples. In my case I believe a very, very, very small mistake that was not reported in the right way. But lots of people in football and even outside football, lots of mistakes were made."