Ben Youngs, George Ford, Ellis Genge and Jaco Taute have all signed new contracts with Leicester Tigers.
The Premiership club confirmed the new deals for England internationals Youngs and Ford at Welford Road were "long-term".
Along with England team-mate Genge, who has reportedly extended his contract by a year, scrum-half Youngs and fly-half Ford had each signed previous terms in January.
South Africa centre Taute, who joined from Munster last year, has also committed his future to the Tigers.
It means 17 Leicester players have now signed fresh terms despite reports of disputes during talks due to the reduction of the salary cap for the 2021-22 season, with Manu Tuilagi and Telusa Veainu among those to depart.
Director of rugby Geordan Murphy said seeing the likes of Ford "showing a belief in what we are building here and the vision we have for Leicester Tigers is exciting".
He added of Youngs: "Ben loves Leicester Tigers and, like all of us at this club, wants to see it get back to where it belongs.
"He knows there is a tough journey ahead which will take a lot of hard work, on and off the pitch, and has expressed throughout this process that he is committed to whatever it takes."
Leicester were 11th in the table, with four wins from 13 matches, when the Premiership season was suspended in April due to the coronavirus pandemic, with only Saracens keeping off them bottom as they were deducted 105 points for breaching salary cap regulations.
The competition is due to resume from August 15.