Steven Matz may test shoulder Wednesday

CINCINNATI — Steven Matz remains in wait-and-see mode, hoping that his left shoulder responds well enough to progress past throwing off flat ground.

Mets manager Terry Collins said Matz may throw again on Wednesday, just as he did on Monday, to test his shoulder and the impingement that is threatening the remainder of his season. But there is no set date for the Long Island lefthander to attempt throwing off a mound.

“We’ll see how the rest helps him,” Collins said. “And some of the medication he was on, we’ll see how that works.”

Jacob deGrom has yet to begin throwing. Forearm soreness also has threatened to end his season prematurely.

Cecchini promoted

Former first-round pick Gavin Cecchini thought his reward for a standout season at Triple-A Las Vegas would be a trip to the Arizona Fall League. It wound up being something much more significant.

“It’s a dream right now, man,” Cecchini said on Tuesday, shortly after arriving with the Mets’ last wave of September call-ups. “It’s everything that I imagined.”

The 12th overall pick in 2012, Cecchini, 22, hit .325 with an .838 OPS in 117 games with the 51s. He played mostly at shortstop, though he recently saw some action at second base. His season will end with his first taste of the big leagues.

With Neil Walker undergoing back surgery, the Mets placed him on the 60-day disabled list, which opened a spot on the 40-man roster.

Extra bases

T.J. Rivera won the Pacific Coast League batting title, outdueling teammate Brandon Nimmo in a race that went to the final day. But Rivera said he has taken satisfaction in another development. “I’m glad to be here,” said Rivera, who was among Tuesday’s call-ups. “That’s my biggest accomplishment.” Rivera finished hitting .353, just ahead of Brandon Nimmo at .352 . . . In his last-ditch effort to return before season’s end, Lucas Duda has progressed to limited work in the batting cage. But it’s unclear when he will begin taking batting practice.