At a pre-workout news conference with his Atlantic League team, Clemens responded to conjecture about a possible return to the Major Leagues by saying, "I don't see it happening."
Clemens last pitched in the big leagues in 2007, when he posted a 6-6 record and 4.18 ERA in 18 appearances with the Yankees. He tallied 354 career victories and seven Cy Young Awards during his 24-year career. He pitched for his hometown Astros from 2004-06.
Clemens, who turned 50 last month, tossed 3 1/3 scoreless innings in his first outing with the Skeeters on Aug. 25. He gave up one single and struck out two, displaying a fastball that topped out around 88 mph.
Clemens, who has repeatedly voiced that he is only returning to professional baseball to have fun, is scheduled to make his second start on Friday. That hasn't stopped the Astros from keeping tabs on him, however. Owner Jim Crane has said previously the team would have interest in him pitching for the club this year.
Houston also sent a scout to watch Clemens' first start, and general manager Jeff Luhnow said the club will have a scout on hand to monitor his outing on Friday.
"We're going to make sure we're prepared," Luhnow said. "If we have the information from a baseball perspective to see what he looks like, we're going to have a scout there. It's an easy game for us to cover."