Max Scherzer of the Mets delivers a pitch in the fourth inning...

Max Scherzer of the Mets delivers a pitch in the fourth inning against the Marlins in a spring training game at Roger Dean Stadium on March 21 in Jupiter, Fla. Credit: Getty Images/Mark Brown

JUPITER, Fla. — Max Scherzer still is scheduled to pitch Saturday in a scrimmage against Mets minor-leaguers, a team source said Friday night, despite reports about him dealing with a minor hamstring issue.

With Jacob deGrom out indefinitely with a stress reaction in his right shoulder blade, Scherzer is the obvious choice to start on Opening Day, but the Mets have not made that official.

Manager Buck Showalter said the team will not be more cautious with Scherzer because of deGrom’s injury.

“I don’t know if we can be any more cautious than we’ve been,” he said. “We’re not rushing. He’s already had extra days two or three times. I don’t know how much we can turn that knob up of cautiousness. Not pitching, that would be real cautious.”

Scherzer is penciled in for seven innings and “probably under 100” pitches, Showalter said, at Clover Park in his final tuneup before the regular season opens Thursday.

James McCann, who missed both of Scherzer’s Grapefruit League appearances, will catch him. Backup catcher Tomas Nido and a handful of relievers also will participate.

Most of the Mets will have the day off, a short-notice gift from Showalter for what is expected to be a rainy day on the last weekend of spring training.

Showalter said the “well deserved and needed” day off technically is optional.

“I asked guys: If they might want to come in tomorrow and hit off Max, they were welcome to,” he said.

He had no takers.

n  New old-timers

Bartolo Colon and Yoenis Cespedes are set to attend Old-Timers’ Day on Aug. 27, a team official said.

Colon was an OK pitcher for the Mets from 2014-16 but became a fan favorite for his portly form and comically bad hitting (and that one home run on May 7, 2016).

Cespedes helped the Mets reach the World Series in 2015 after being acquired at the trade deadline. He never again appeared in the majors after abruptly walking away from the team on Aug. 2, 2020.

n  J.D. Davis, pitcher?

J.D. Davis, a part-time closer during his Cal State Fullerton days, impressed Showalter with his throws from third base recently, drawing jokes from the manager that maybe Davis would get on the mound in the right situation.

“He’s fun to be around,” Showalter said. “I’ll tell you, he’s come on at third base a little bit the last few games. I finally got to see the plus-plus arm strength everybody told me about. I said, ‘You’re out of the bag for that late-inning pitcher now if we run out of pitchers.’ He’s excited about it. Not that he’d be the guy.”

Davis made three relief appearances for the Astros in 2017-18.

n  Extra bases

Alex Ramirez, 19 years old and the Mets’ top outfield prospect, made his first Grapefruit League appearance and went 1-for-3 with a walk, picking up a single off the Cardinals’ Blake Parker. The Mets lost, 7-2 .  .  . Lefthander Alex Claudio was OK after taking a line drive off his right shin, Showalter said .  .  . Catcher Nick Dini, who took a spill behind the plate Thursday, is expected back Sunday.