Mets cancel Pelfrey's bullpen session

New York Mets manager Jerry Manuel said Mike Pelfrey will not throw a standard between-starts bullpen session in preparation for Friday's start against the San Francisco Giants.

However, that wasn't Pelfrey's call, according to Manuel. It was the decision of pitching coach Dan Warthen, who wants to be cautious after Pelfrey experienced shoulder tightness before and after his Saturday start in Philadelphia.

Pelfrey, who had a precautionary MRI before the Mets opened their series in Cincinnati, instead will throw what Manuel labeled a "touch and feel" -- essentially light tossing off a mound rather than going full throttle.

"That's Dan Warthen's call. He'd rather him not aggravate it or whatever," Manuel said. "... During the course of the year you choose when you want a guy to miss a side [session]."

Warthen reiterated that it was his call.

"One hundred percent me," Warthen said. "He was ready to go. The trainers had him all stretched out ready to go. I said, 'Let's use common sense here.'"

Pelfrey instead will step on the mound for a light work Wednesday -- 15-18 pitches at up to 75 percent effort. A standard bullpen session is 60-70 pitches at 90-95 percent effort.

"Why take a chance at firing something up for no reason right now?" Warthen said. "The arm feels pretty good right now. If we give it the full rest, go out there and get a little rhythm and timing tomorrow, hopefully we won't have this same flareup and won't have to fight with this back and forth. This is a tendinitis issue. Most of the time a little rest helps that."

Adam Rubin covers the Mets for ESPNNewYork.com. You can follow him on Twitter. Information from The Associated Press contributed to this report.