Scotland hooker Fraser Brown is the latest player to commit his long-term future to the Glasgow Warriors.
The 28-year-old is now committed to the Scotstoun club until at least the end of the 2020 season.
Glasgow have been busy securing the futures of their squad in recent weeks, and Brown follows Jonny Gray, Niko Matawalu, Ali Price and Nick Grigg in signing new terms.
Brown has been with Glasgow since 2013, making 69 appearances, and he has been capped 29 times by his country at senior level.
Ahead of the 1872 Cup clash with rivals Edinburgh, Brown told Warriors TV: "My desire and my family's desire was always to stay here. This club means a great deal to me as they gave me the opportunity to come back into the professional environment after I left Edinburgh.
"Since I've joined I've gone from strength to strength, I've gone from being a squad player to a member of the 23.
"Being at Glasgow Warriors has allowed me to push on with my national ambitions as well as helping me to develop, not just as a player but as a person as well. We've got a great group of guys here and it's a brilliant squad.
"Having the knowledge that the coaches at Scotstoun and the coaches at BT Murrayfield are going to look after us the best they can in terms of the rest protocols and the day-to-day management was definitely a big part of why I wanted to stay at Glasgow.
"It's exciting to sign my new contract ahead of the 1872 Cup double header with Edinburgh Rugby. There is always something a little bit special and a little bit extra about these derby games."