Jon missed Scotland's first two Six Nations games but his performances in some great diplays by the Glasgow backrow have led to a recall to the squad.
Jon is joined by fellow Glasgow players Andy Henderson, Dan Parks, Cammy Mather and Gordon Bulloch.
Jon will still lead Glasgow in the Celtic League match against Connacht at Galway Sportsground.
He travelled with the Glasgow squad to Galway this afternoon. But he and Dan Parks will return home ahead of their Glasgow colleagues after the Connacht match to join up with the Scotland squad on Sunday.
Mike Blair (Edinburgh Rugby)
Gordon Bulloch (Glasgow Warriors)
Simon Cross (Edinburgh Rugby)
Chris Cusiter (The Borders)
Simon Danielli (Bath Rugby)
Bruce Douglas (The Borders)
Scott Gray (Bath Rugby)
Stuart Grimes (Newcastle Falcons)
Andy Henderson (Glasgow Warriors)
Nathan Hines (Edinburgh Rugby)
Ben Hinshelwood (Worcester)
Allister Hogg (Edinburgh Rugby)
Allan Jacobsen (Edinburgh Rugby)
Gavin Kerr (Leeds Tykes)
Brendan Laney (Edinburgh Rugby)
Derrick Lee (Edinburgh Rugby)
Cameron Mather (Glasgow Warriors)
Scott Murray (Edinburgh Rugby)
Dan Parks (Glasgow Warriors)
Chris Paterson (Edinburgh Rugby)
Jon Petrie (Glasgow Warriors)
Tom Philip (Edinburgh Rugby)
Robbie Russell (Saracens)
Tom Smith (Northampton Saints)
Simon Taylor (Edinburgh Rugby)
Jason White (Sale Sharks)
Simon Webster (Edinburgh Rugby)