Scott Parker has vowed Fulham will learn lessons from their mistakes last time in the Premier League and will not make drastic changes.
Left-back Joe Bryan was the surprise hero at Wembley on Tuesday with the first brace of his career sending the Whites back to the top flight with a 2-1 extra-time victory over local rivals Brentford.
It is the second time in three years Fulham have won the Championship play-off final, but they endured a torrid most recent season in the Premier League.
Despite spending over £100m on eight permanent signings plus five high-profile loans ahead of the 2018-19 campaign, the Craven Cottage club shipped 81 goals and finished 19th.
"You can't build teams with drastic changes and drastic swings of players, you can't do that," Parker said. "This team have been around myself for the best part of 15 months and they've improved, improved and improved.
"A lot more improvement needs to be done, for sure, but I am happy with where we are.
"Of course we will need additions, we are going into the biggest league there is and we will need to add, but for sure no drastic changes."
Winger Neeskens Kebano has agreed a two-year contract extension following the Cottagers' promotion.
Kebano has been a key player for Fulham in the latter stages of the season, scoring five goals in his last five games including a free-kick in the play-off semi-final win over Cardiff.