Another day, another setback in rehab. This time it's Mets reliever Bobby Parnell, who will be shut down for the next five days with soreness in his right forearm.

But general manager Sandy Alderson said Friday that an exam with Dr. David Altchek revealed no other issues. "Generally speaking, the news on Bobby is good," Alderson said.

Parnell is in the latter stages of his rehab from Tommy John surgery, but his fastball velocity and the sharpness of his curveball have yet to return fully.

Parnell had been expected back in early May, not long after the projected return of fellow reliever Vic Black, who has been battling a nerve issue that has caused extreme fatigue in his shoulder. Parnell and Black, however, have been shelved during their rehab assignments.

"We're certainly disappointed that's taken place because we were hoping that they would both be back here in about 10 days," Terry Collins said. "It doesn't look like that's going to happen."

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Twitter battle

Top prospect Noah Syndergaard fired back at a fan who used Twitter to question the pitcher's toughness for missing his scheduled start Friday because of illness. The exchange featured a few pointed insults from Syndergaard, who has since heard from the organization regarding his comments.

"Generally speaking, Twitter is more of a trap than a means of positive communication for athletes and executives," said Alderson, who has caused waves with his own Twitter account. "So I caution them against it."

Syndergaard missed his turn in the rotation but should make his next start. Alderson said he had "fairly serious" food poisoning that required an IV.

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Extra bases

Mets hitting coach Kevin Long hit a snag in his first trip back to the Bronx. "As I was driving in, I said, 'Oh, where am I going to park my car?' " said the former Yankees hitting coach, who needed help finding the visitors' lot . . . Righthander Rafael Montero remains on track to be recalled for a start Tuesday . . . Michael Cuddyer will be the designated hitter Saturday, allowing John Mayberry Jr. to get in the lineup against lefthander CC Sabathia.