Glasgow Warriors will play their first warm-up fixture against Newcastle Falcons on Friday, August 12.
"All available players will be used over the two matches, which will give the fans a fantastic opportunity to see a strong new look Warriors side."
Nathan said: "I'm really looking forward to wearing the jersey for the first time, putting in a good performance and making my mark on the team.
"I've played at Firhill four times before for Connacht and they are really vocal and passionate so I can't wait to be playing for their team.
"Supporters mean so much to me, they are the sixteenth man so I encourage as many people to come down and watch what promises to be a brilliant fixture."
A second warm-up fixture is also due to be played on Friday, August 26 against Sale Sharks on their home turf at Edgeley Park, Stockport.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
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 All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
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.