A former Scotland 7s captain, Forrest officially joins the club's coaching team after being involved with the Glasgow Warriors academy during the 2024/25 campaign, working with Shade Munro for Glasgow Warriors U23's victory over Benetton and the Glasgow Warriors A squad in their clash with Black Lion.
Born in Rutherglen and a former student at the University of Strathclyde, the 40-year-old served as Head Coach for Great Britain's women's 7s squad at the 2020 Olympic Games in Tokyo, having previously held the same position for the Scotland Women's 7s squad.
Forrest will join pre-season preparations at Scotstoun following the conclusion of the World Rugby U20 Championship, where he will be serving as one of Scotland U20's assistant coaches under Kenny Murray.
"I'm really looking forward to working with everyone - it's an incredibly exciting coaching group," said Forrest.
"Having had the opportunity to work alongside Franco and Nigel over the past season in my role with the club's A team and academy, I'm excited to take this a step further over the coming seasons.
"I'd also like to mention that working alongside Pete Murchie this season has been of huge benefit – he leaves huge large shoes to fill, but I'm excited to build on the excellent work he's done since leading the team's defence.
"My time spent coaching the U20s over the past few years, as well as my time with Scotland 7s, mean that I know a lot of the players at the club, and having been in the environment over the last year or so I'm looking forward to continuing to build those relationships.
"I've always tried to give players the autonomy to make decisions as ultimately they are the ones that have to perform in high pressure situations. I'd say that I have a positive approach whilst always working to instil the standards required to perform at the highest level.
"I know Roddy well from our times playing for Scotland 7s together, and I've seen him go on to develop into a top-class coach. It'll be great to work alongside him once again and I'm confident we both have a lot to contribute to the environment at the Warriors."
Fellow former Scotland 7s stalwart Grant will join Glasgow Warriors following the conclusion of his current role as assistant coach of Georgia, with whom he will work ahead of their matches with Emerging Ireland and South Africa next month.
Born in Botswana, the 38-year-old was a firm fan favourite over a six-year spell with Edinburgh, for whom he amassed 138 appearances in the back-row, as well as in a Scotland 7s career that saw him represent his country at the 2014 Commonwealth Games in Glasgow.
Upon retiring, Grant took up a role with the Scottish Rugby Academy, before returning to Edinburgh as a coach in 2017.
The former back-rower has close experience of coaching in the BKT URC, having served as Forwards Coach at Ulster over a five-year spell from 2019 to 2024 in addition to his time at Edinburgh.
"I've had so much respect for Glasgow over the last two decades of being involved in the BKT URC - Franco [Smith] is such an impressive coach, and such an impressive person," said Grant.
"The opportunity to come into such a successful environment and such a top-level culture was one I jumped at, and I'm looking forward to being able to contribute to that environment.
"It's a really exciting group here. Having coached against Franco for a number of years, I can't wait to work alongside him. I'm a huge admirer of Nigel's work as well, he's been hugely successful wherever he's been. To have the chance to work with Scott, too, is a special opportunity. We've known each other since 2006, so to be able to coach alongside each other is an exciting prospect.
"I like to believe that I treat people how I'd like to be treated, both on and off the field. I appreciate technique, and the art and science behind everything we do. The great thing about pro sport is that you're around incredible people, and I hope to make those strong connections with everyone here at Scotstoun."
Al Dickinson will also continue in his role as consultant Scrum Coach, with Shade Munro working with the club's academy prospects.
Speaking following the announcement of his coaching team, Head Coach Smith said: "We are pleased to be able to confirm our coaching group as we turn our attention towards the new season.
"I would first like to once again thank Pete [Murchie] for everything that he has done for this club on and off the field over the past three seasons, and everyone at the club wishes him and his family well with their new adventure.
"We are pleased to be able to retain Nigel's services as we prepare for the new campaign - he is someone that is thoroughly respected by everyone in both the playing group and backroom team, and his experience and expertise are valuable assets to the club.
"We are also excited to welcome Roddy and Scott into their new roles - both men have already shown that they are fully bought into what we are looking to build here, and the players and I are looking forward to working closely with them when pre-season gets underway."