PHOENIX — Yoenis Cespedes took his first steps toward rejoining the Mets, going 0-for-3 with an RBI groundout Monday night as the designated hitter with Class A St. Lucie.

Barring any setbacks, Cespedes will continue his rehab from a strained right quadriceps in the Florida State League before he’s activated Friday for the Mets’ game against the Giants.

“It was good to get back on the field again,” Cespedes said in a statement released by the team. “If things keep going OK, I hope to be with the team in San Francisco. I just want to help in any way I can.”

Cespedes is expected to play leftfield in his next two games.

Shortstop Asdrubal Cabrera (knee) will begin his rehab assignment Tuesday as the designated hitter with St. Lucie. Righthanded-hitting outfielder Justin Ruggiano (hamstring) began his rehab assignment Monday night with Triple-A Las Vegas and went 1-for-3.

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Wheeler exam Wednesday

Zack Wheeler’s appointment with Dr. James Andrews has been bumped back to Wednesday. The righthander hasn’t thrown since his rehab assignment Aug. 6. He has been dealing with lingering elbow soreness that has caused what might be another setback in his bumpy comeback from Tommy John surgery.

The Mets had hoped he’d return by the All-Star break, but his window to make a comeback this season is closing by the day.

Assistant general manager John Ricco said Wheeler is being sent to Andrews “just to have another set of eyes on it.”

Extra bases

Mets videos

The Mets have shown no interest in outfielder Carlos Gomez or reliever Jonathan Papelbon. They remain interested in acquiring a righthanded reliever . . . Righthander Logan Verrett will seek a second opinion after doctors saw no structural damage in his stiff neck. Verrett complained about the stiffness, which could force the Mets to rescind his recent demotion to the minors.