Harlequins have agreed new deals with front-row duo Joe Marler and James Johnston.
Loosehead prop Marler, who was added to the England squad as injury cover in the autumn, has signed a three-year extension to his current deal.
And Samoa tighthead prop Johnston, who joined Quins from New Zealand club Ponsonby in 2009, has put pen to paper on a contract to remain at the Stoop until 2013.
Quins director of rugby Conor O'Shea said: "We believe we are a squad that can win things now but as we build the experience of this group of players, we will become stronger and stronger.
"Joe and James Johnston are two outstanding talents and we are delighted that they, along with so many others within the squad share the vision we have of building a successful team for many years to come."
And Marler believes the Quins squad as the potential to become one of the top teams in the country.
Marler said: "I am really happy to have re-signed with Quins. I want to be a part of a squad which can win now, but also grow together and become a new force, and I think this is the team to do it with.
"It is a great opportunity for me to keep progressing and with so many young players coming through and challenging for starting places, Harlequins is a really exciting place to be."