Cobb will pitch for the Class A Charlotte Stone Crabs. He threw 59 pitches Thursday in a simulated game at the Rays' spring training complex.
"It went well," Cobb said. "It was nice to get out there and see competition again."
In a scary incident, Cobb was struck in the right ear by a liner hit by Kansas City's Eric Hosmer on June 15.
Cobb, who suffered a concussion and was removed from the field on a stretcher after being hit, is 6-2 with a 3.01 ERA this season. He said earlier this month that he hopes to rejoin the Tampa Bay rotation at some point in early August.
Major League Baseball has been trying to come up with protective headgear for pitchers such as a protective cap lining. However, no product has received approval.
"Research is still ongoing," Dr. Gary Green, MLB's medical director, said Friday. "We are still in the testing stage with several companies making good progress."
Information from ESPN "Outside The Lines" producer William Weinbaum and The Associated Press was used in this report.