"Once I talk to Carl and see how it looked today, then we'll go from there," Wedge said. "If it went well, then we'll get him [throwing] off the mound and go from there. But let's see today goes first."
Once reports were positive, the Mariners said Hernandez could start Wednesday in Detroit if all goes well now in Monday's bullpen workout.
Hernandez hasn't pitched since Sept. 2 in Kansas City, when he felt some tightness in his lower back in the seventh inning of a 3-1 loss to the Royals.
He initially was scheduled to start again on Sunday, then had that delayed until Wednesday before his start was canceled completely after continuing to feel some stiffness in his side during a light throwing session.
The Mariners only have 15 games remaining after Friday's series opener against the Cardinals and have been clear that they wouldn't push Hernandez's return unless he's completely healthy.
The 27-year-old has thrown 194 1/3 innings to date, going 12-9 with a 3.01 ERA in 29 starts with 41 walks and 200 strikeouts. He's pitched 200-plus innings each of the last five years and this is the fifth straight season he's notched at least 200 strikeouts.
Going into Friday's games, Hernandez was still tied for fourth in the American League in strikeouts and tied for sixth in innings pitched.
Greg Johns is a reporter for MLB.com. Follow him on Twitter @GregJohnsMLB as well as his Mariners Musings blog. This story was not subject to the approval of Major League Baseball or its clubs.