The wider training squad gathered on Monday and two teams are entered in the event, playing as the GB Lions and GB Royals.
Lee Jones has recent experience of competing on the HSBC World Rugby Sevens Series as well as at the 2014 Commonwealth Games having played well for the Warriors this season, notching two tries against Scarlets at the tail end of last season.
Coach Simon Amor said: “Lee gives us options in a number of positions and was right on the edge of making the initial squad. He’ a very talented player."
GB Sevens squads for this weekend
GB Royals
Cory Allen
Tom Bowen
Alex Davis
Jamie Farndale
Alex Gray
Warwick Lahmert
Ollie Lindsay-Hague
Ruaridh McConnochie
Luke Morgan
Scott Riddell
Joe Simpson
Luke Treharne (C)
Fixtures (all times in BST with a live stream available via www.rugbyeurope.tv)
9.28am v Georgia
12.28am v Lithuania
3.28pm v Russia
GB Lions
Mark Bennett
Dan Bibby
Phil Burgess
Sam Cross
James Davies
Richard de Carpentier
Lee Jones
Gavin Lowe
Tom Mitchell (C)
Dan Norton
Mark Robertson
Marcus Watson
Fixtures (all times in BST with a live stream available via www.rugbyeurope.tv
8.22am v Portugal
11am v France
2.22pm v Poland