Fulham midfielder Stefan Johansen and defenders Tim Ream and Denis Odoi have all signed new deals with the club.
Norway international Johansen, who is in his fourth season at Craven Cottage, has extended his stay until June 2022.
Fulham have activated clauses in the contracts of United States international Ream and Belgian Odoi to retain them until the summer of 2021.
Vice-chairman Tony Khan said it was "important" to keep "key players" that helped win Premier League promotion.
Ream was Fulham's player of the year when they were promoted from the Championship in 2017-18.
Fulham FC statement
The Club is delighted to confirm the following activity with regards to the contracts of Stefan Johansen, Tim Ream and Denis Odoi.
Johansen has agreed a new contract which keeps him at Fulham until 30th June 2022. His current deal was due to expire next summer.
Ream’s current deal gave the Club an option to extend it by a further year. We have now taken this option, tying Ream to Fulham until the summer of 2021.
Odoi has agreed a new deal that now sees the Club hold an option to extend his time at Fulham. An option was already activated earlier this summer which keeps Odoi at Craven Cottage until 2020, but the Club can now activate a clause which extends that deal by a further 12 months.
Tony Khan said: “This summer, in addition to adding experienced new players into Fulham’s squad to help us push for promotion, it was also important for us to retain key players who were involved in our promotion two seasons ago.
“Stefan Johansen has made significant contributions at Fulham since he joined us three years ago. He was a vital presence in our midfield in our promotion to the Premier League. He’s proven that he’ll fight for this club, and I’m glad Stefan is staying for the fight ahead of us.
“Denis Odoi has set high standards at Motspur Park for hard work and professionalism since his arrival at Fulham three years ago. Denis is a versatile and experienced defender, and he provides an intelligent and thoughtful presence within the squad, and I’m glad he’ll continue to be a leader for the club.
“Tim Ream was Fulham’s Player of the Year two seasons ago in our promotion campaign. He loves this club, and he’s a leader for us on and off the pitch. The experience and resolve that Tim brings to our defence will be important to the club this season as we’re fighting to get back to the Premier League.
“Come on Fulham!”