LOS ANGELES — Mets catcher Travis d’Arnaud was shut down from baseball activities indefinitely Monday after he was summoned to New York for an exam by team doctor David Altchek.

Assistant general manager John Ricco said d’Arnaud also had a platelet-rich plasma injection to encourage healing in his strained right rotator cuff.

D’Arnaud had been hitting, but when he complained of discomfort after his first attempt at a throwing session this past weekend, he was instructed to rest.

“It’s just going to take more time,” Ricco said. “Shoulders can heal quickly, [or] they can take time. Clearly he’s not ready yet, so we’ll give it more time. Rehab and see where it goes.”

Ricco said the injury should require only rest, not surgery.

The bat

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It turns out that Bartolo Colon pitches, too. The Mets righthander was named co-NL player of the week (with the Cubs’ Ben Zobrist) for going 2-0 with a 1.72 ERA.

Of course, he also did something special at the plate. Colon ended his homerless streak in his 19th season with a memorable two-run shot Saturday night.

The moment apparently resonated. The Topps baseball card company reportedly made record sales of a digital baseball card featuring an image of Colon following through on his home run off the Padres’ James Shields.

Extra bases

Second baseman Neil Walker might be held out of the starting lineup until Wednesday, manager Terry Collins said. Walker still is dealing with a badly bruised right shin after fouling two pitches off the exact same spot . . . The Mets will face three lefties in four games against the Dodgers, but Michael Conforto might start against one of them, with Curtis Granderson going to the bench . . . David Wright is slated for a day off Wednesday, ensuring that he will face Dodgers ace Clayton Kershaw in Thursday’s series finale.