Riggs is currently 42nd in the point standings, with eight starts in the first 12 Sprint Cup races this season. His best finish so far is 25th, which came in the season-opening Daytona 500.

Team owner Tommy Baldwin announced Mike Skinner, Patrick Carpentier and Brian Simo will share driving duties in the No.36 Toyota for the remainder of the season.

"I am looking forward to having Mike, Patrick and Brian behind the wheel of the No.36 Toyota," Baldwin said. "I think they all will be able to help us evaluate where our program is today and help make improvements to bring it to the next level."

Skinner is currently second in Camping World Truck Series points, while Carpentier, a Canadian racer, has one start in the Nationwide Series this year. Simo is a road-racing expert.

"Tommy and I go back a long ways and I know that he is the type of person that NASCAR needs in the Cup Series," Skinner said. "Even though my main focus is the truck, if we can help Tommy along until he finds that permanent driver that he needs to put his team to the next level, then it is an honor for me to get a chance to participate and to try and help him out."