When the Cottagers last won promotion in 2018 owner Khan splashed out over £100m on 12 new players, most of whom flopped.
But he will not spend big this time, instead giving manager Scott Parker, who is set to sign a new contract, more control of transfers.
And it will be a much more targeted approach with Fulham unlikely to invest in more than four or five signings at most.
Parker is keen to bring Ryan Sessegnon back to the club on loan from Tottenham, and free agent Ryan Fraser is also on his radar.
In an open letter to Fulham fans, Khan wrote: “Be assured that we will be a team, in its truest sense, moving forward.
“We will be unafraid to improve and add pieces to our lineup, but not at the expense of the spirit and soul of a squad that bled, battled and sacrificed to return Fulham to the Premier League.
“Building a squad can be a tricky proposition for a newly promoted club, and that is especially true this year with the start of the season already nearly upon us.
“Turnover in football is inevitable. But, this Club has Premier League experience and our players, as well as our young and promising Head Coach, love Fulham Football Club.
“There is a lot to like in this team today, and just as much to like in our future.”
Fulham secured their path back to the top flight with a 2-1 win over Brentford in the Championship play-off final.
They join West Brom and Leeds United – but the Elland Road side are more concerned about securing the future of their manager Marcelo Bielsa.
And they could move on to target Tottenham defender Juan Foyth in a double swoop.