An angry Johan Santana arrived at Tradition Field yesterday, upset about reports that raised doubt regarding his offseason throwing program and whether that may set back his readiness for the regular season.

So after long-tossing with Pedro Feliciano, Santana pitched off a mound for the first time since Feb. 19.

“There were comments and maybe they were motivational — even by the general manager [Sandy Alderson] — because he [Alderson] didn’t say he [Santana] was going to be out there for a few days,” pitching coach Dan Warthen said a day after Alderson had said Santana wasn’t ready to pitch when he arrived at camp. “And Johan said, ‘I’ll prove you guys are wrong.’ Maybe it was a pretty good motivational thing.”

Maybe. Either way, while the Mets may not have the stars they used to, they’re still a soap opera.

Alderson was asked yesterday if he made his comments to spark Santana and he declined comment, saying only: “I’m not going to get into a tennis match.”

When approached by reporters after his bullpen, an agitated Santana said he wouldn’t answer questions about the fatigued left shoulder that has held him back.

“What’s spring training for?” Santana said in front of his locker. “What’s practice? To get you better. That’s what I’m doing right now. That’s what I’m here for and that’s what I’m going to do. That’s what I’m working on.”

He certainly didn’t go all out during the 15-pitch session to Anthony Recker, who was positioned in front of home plate, but it still took the Mets by surprise.