The Stage 3 players will join a select number of Scotland 7s and club rugby players in boosting pre-season squad depth at Scostoun ahead of the 2019/20 season.
Front-row pair Euan McLaren and Murphy Walker both represented Scotland at the U20s World Championships in Argentina having been Stage 3 players last year.
Second-row duo Cameron Henderson and Marshall Sykes also retain their Stage 3 status and were both involved in Carl Hogg's squad this summer.
Fly-half Ross Thompson and utility back Ollie Smith continue as Stage 3 players having also gained experience in Rosario with the U20s.
Midfielders Grant Hughes and Robbie McCallum are new additions to this year's pool of Stage 3 players.
Fosroc Scottish Rugby Academy Stage 3 Players training with Glasgow Warriors for pre-season block one:
Cameron Henderson
Grant Hughes
Euan McLaren
Robbie McCallum
Ollie Smith
Marshall Sykes
Ross Thompson
Murphy Walker
Meanwhile, Scottish Rugby today confirmed the country's leading young players to be recruited, retained and promoted into the top, full-time tier of the Fosroc Scottish Rugby Academy.
The academy, which enters its fifth season, aims to accelerate the development of the nation's most promising young players at one of four regional centres (Aberdeen, Ravenscraig, Edinburgh and Galashiels), which develop, deliver and monitor individual programmes for selected players.
This season saw six more academy players sign senior professional contracts at Glasgow Warriors (Jamie Dobie, Tom Gordon, Stafford McDowell and Grant Stewart), Edinburgh (Jack Blain) and Scotland 7s (Kyle Rowe).
The promotion of players through the ranks has, in part, created space for this season's intake, which sees 19 new faces join the top tier of the system - 13 promoted from the earlier 'supported' stages and four new entrants.
The male Stage 3 players will continue to work closely with Scotland's professional sides, which offer opportunities to develop through training and playing, while the advent of Scottish Rugby's new top, part-time professional tier - Super6 - will change the competitive landscape for these players, with five allocated to each of the competing teams.
2019/2020 Fosroc Scottish Rugby Academy Stage 3 players (30)*
Retained (13): Connor Boyle (Watsonians), Rory Darge (Melrose), Roan Frostwick (Currie Chieftains), Shaun Gunn (Edinburgh Accies), Cameron Henderson (Stirling County), Euan McLaren (Ayr), Rufus McLean (Watsonians), Finlay Scott (Jed-Forest), Ollie Smith (Ayr), Marshall Sykes (Ayr), Ross Thompson (Glasgow Hawks), Murphy Walker (Stirling County), Dan Winning (Boroughmuir).
Promoted (13): Gregor Brown (Robert Gordon's College/Gordonians), Matt Currie (Merchiston Castle School), Angus Fraser (Glasgow Hawks), Dan Gamble (Merchiston Castle School), Jacob Henry (Melrose), Grant Hughes (Stirling County), Rory Jackson (Edinburgh Academy/Accies), Rory Jackson (Kelvinside Academy), Charlie Jupp (Heriot's), Kristian Kay (Glasgow Hawks), Scott King (Heriot's), Jack Mann (Edinburgh Accies), Cameron Scott (George Watson's College)
New addition (4): Sam Grahamslaw (Leicester Tigers), Robbie McCallum (Complutence Cisneros), Harry Paterson (Fettes College / Edinburgh Accies), Nathan Sweeney (Loretto School/Musselburgh).
Sean Lineen, Head of National Age-Grades and Academies, said: "The academies continue to produce players for our professional teams on a regular basis and have a major influence on our national age-grade teams - and increasingly on senior professional and national selection.
"The players are coming through stronger club and school systems, with the introduction of Super6 later this year designed to narrow the performance gap with senior pro rugby and enhance the programme for promising young players in a really compelling playing environment."
The intake for the 'supported' stages (one and two) of the programme will be announced after the regional age-grades series, to allow players to demonstrate their future potential and play their way into the programme.
* Clubs / schools listed at time of signing as Stage 3 player with the Fosroc Academy