The 31 year old Scotland international has been working his way back to full fitness in recent weeks having picked up a groin injury against Harlequins back in February.
As a result, he was denied the opportunity to bid farewell to the Gloucester Rugby supporters and the call up to the Barbarians squad could possibly put that right.
A keen student of the game, Lawson admits that he's looking forward to featuring in the famous black and white shirt for the first time.
"It has always been an ambition of mine for a long time and Barbarians are a club that have such amazing history.
"It is fantastic to be a part of. My dad played for them on a number of times so it is something that is a great experience.
"It is something that I have always admired what they are about and it has been an ambition of mine growing up in Scotland to play for them so it is fantastic I am now being offered the opportunity.
"I could possibly get my Barbarians debut at Kingsholm. There is one England game first, but certainly in terms of the tour, it would be great for me to get back to playing at Kingsholm, that would be fantastic.
"It would obviously be unbelievable to have a lot of the Gloucester fans, who have been there for us in the six years I have been at the club, to be there as well because I would really like to thank them for their support."