The 25-year-old centre, who won the most recent of his seven caps two years ago, was omitted from Scotland's matchday squad for Saturday's clash with Italy at Murrayfield.
Instead he plays in Edinburgh's friendly at Edgeley Park this Friday and appears set to miss out on a place in Andy Robinson's 30-man World Cup squad, which will be named on Monday.
Prop Ryan Grant and flanker Rob Harley featured in Glasgow Warriors' pre-season match with Newcastle last week.
The trio remain part of the 38-man Scotland squad, but are the only members of the squad to not be involved in the warm-up Tests.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The Barbarians are one of the top invitational rugby sides with a long history and classic rugby jersey.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Lions get ready for their matches with this green training jersey. It's what the players wear. Get in the Gear!
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The Lions are ready to get their Australia tour underway. They arrive in Perth on Monday.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.