Six Harlequins players have committed their future to the London club.
England prospects Rob Buchanan, Tom Casson, Joe Gray, Charlie Matthews and Dave Ward have all signed contract extensions until the end of the 2015/16 season, while Ben Botica has extended his contract until the end of the 2016/17 season.
Both Buchanan, 22, and Gray, 25, have toured with England, whilst a third hooker Ward, 28, was recently called up to feature for the England Saxons.
Fellow Saxon Matthews, 22, centre Casson, 23, and fly-half/centre Botica, 24, have also impressed Harlequins director of rugby Conor O'Shea on both the European and domestic fronts in the past two seasons.
O'Shea said: "We are obviously delighted that these players have committed to us and will continue their development at Harlequins.
"They are here to win trophies but they also understand that if the group succeeds then they will be in a position to achieve their personal aims.
"As much as we are able to, we want to keep the core of our group together for as long as possible and their commitment really allows us to push on and plan for the future."