Frank Lampard has not ruled out a spending spree amid reports linking Kai Havertz and Jan Oblak with Chelsea.
Lampard has already sealed the big-money signings of Ajax winger Hakim Ziyech and RB Leipzig forward Timo Werner.
The Blues are said to be leading the chase for forward Havertz, who Bayer Leverkusen reportedly value in the region of €100 million (£90m), and Atletico Madrid goalkeeper Oblak is also thought to be a target.
Lampard was unable to do any business before the start of this season due to a transfer embargo, which was lifted in December.
The former England midfielder did not reveal whether Chelsea owner Roman Abramovich is ready to spend big yet again, stating he is focused on the challenge of securing a top-four finish in the Premier League and winning the FA Cup.
"We'll see. I can't answer that one, we're not there yet," Lampard said on Friday when asked about potential recruits in the transfer window.
"We have to focus on what's in front of us and we'll see. I wouldn't want to compare it to any other spending summer, we'll see how I feel and we feel as a club and if the squad needs strengthening or the balance needs changing.
"If it does and we make moves, great. At the moment we don't know."
Ziyech has spent his first week of training with the London club and Lampard says he quickly fitted in.
The Blues boss said: "Hakim has been here for the week, trained a couple of days on his own and then he's integrated a bit with the team so he's settling in well. The lads have welcomed him and he's forming those new relationships in the early stages.
"More importantly for him, he's been getting himself fit. It's been nice for him to take a bit-part in training and then also get some physical work because he hasn't trained or played for a quite a while."