Justin Verlander OK after session
Verlander, who had core muscle surgery in January following a groin injury, threw a 30-pitch bullpen session Sunday.
"I think the feeling from the get-go was that, because of the type of shape he kept himself in, this was a guy that might have the ability to be back in time to start the regular season," Ausmus said. "It seems like he's on track for that right now."
The Tigers play the Philadelphia Phillies' split squad Thursday.
The Associated Press contributed to this report.
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The Cubs are at the top of Keith Law's list of the top five minor league farm systems.