NEW YORK -- Johan Santana threw the first no-hitter in Mets history on Friday night, but it came at a price.

Left-fielder Mike Baxter suffered a displaced right collarbone next to his sternum and fractured rib cartilage after colliding with the wall while making a spectacular catch in the seventh inning, and is expected to miss up to six weeks, according to manager Terry Collins.

Right-handed reliever Ramon Ramirez also suffered a strained right hamstring while running out of the bullpen to celebrate Santana’s accomplishment and is headed to the disabled list as well, Collins said.

No corresponding roster moves were announced.

Baxter walked off the field holding his left arm after making the catch, and the Mets thought he injured his left shoulder. But a battery of tests taken Saturday revealed otherwise.

Fortunately, tests revealed that Baxter did not sustain a concussion.

“My left arm went numb, and they thought (my shoulder) was dislocated on the field,” Baxter said. “And as the night progressed, the wall kind of pushed up against the right side of my chest, and that’s where there was some compression.”

“That tells you just how hard he hit the wall,” Collins added.

Baxter, 27, who grew up a Mets fan in Queens, had been playing extremely well. He was batting .323 with 10 RBIs.

“We gotta take our time and let it heal itself, and hopefully it’ll respond quickly,” Baxter said.

“It’s always tough to get hurt, especially with the way this team’s playing. It’s so fun to be a part of what’s going on here.”

Ramirez, 30, is 2-1 with a 4.78 ERA in 22 appearances out of the bullpen.