Harlequins prop Mark Lambert has committed his future to the Premiership champions by signing a new two-year deal.
Lambert - graduate of the Harlequins Academy - joins fellow front-rowers Kyle Sinckler and William Collier in signing a new contract at the Twickenham Stoop
The 27-year-old has made 89 appearances for Quins and Conor O'Shea is delighted that the experienced prop has opted to stay at the club.
"There are people who epitomise what a club is about and what a team is about and Mark is one of those players," said O'Shea.
"He gives his heart and soul for Harlequins and having made the transition from tight-head to loose-head so seamlessly he is someone we are going to rely on heavily in the years to come if we are to attain the goals we all aspire to.
"Everyone involved with Harlequins is delighted that Mark will continue to develop and push on wearing the Harlequins colours."
Lambert added: "When I signed for Quins at 18 I could never have dreamt of being here for over a decade. In my years at the club I've been through deep lows and massive highs, both personally and collectively.
"Last season was more than a dream come true and I feel privileged to have played my part in it, but I look forward to contributing more in future successes. I still feel I have much to prove to myself and others in the quartered shirt. I will relish that challenge."