PHILADELPHIA — A downcast Marcelo Mayer, wearing a brace on his right wrist, said he’s awaiting information on the wrist injury that caused him to leave Wednesday’s game in the fifth inning.

Mayer and the Red Sox are awaiting word on the severity of the injury, which the team deemed “right wrist discomfort” after the rookie was replaced in the field at third base by Abraham Toro in the bottom of the fifth. According to a baseball source, Mayer is undergoing an MRI in Boston on Thursday.

“I don’t know right now,” he said. “I just iced it. It feels in some pain but hopefully it’s not too serious and I can get back on the field soon.”

Mayer worked a two-out walk to load the bases in the top of the fifth before Jesús Luzardo completely lost control and issued back-to-back bases-loaded walks to Rob Refsnyder and Jarren Duran before allowing a game-changing grand slam to Romy Gonzalez. It was in that at-bat Mayer, who was caught by ESPN cameras motioning toward his wrist in the dugout, felt something.

“I just felt a little tight grab in my wrist when I took a swing in my second at-bat,” Mayer said. “I knew I really couldn’t do anything after that so I just called it (a game).”

The fact Mayer’s injury occurred on a swing opens up the possibility that it’s related to the hamate bone, but that’s not confirmed at this time. Manager Alex Cora said the club knew very little about the injury after a dramatic, 9-8 win over the Phillies. It should be clear what Mayer is dealing with by the time the Red Sox resume their schedule at home against the Dodgers on Friday night.

“I still need to get with the medical staff and go over it and see what’s good,” Mayer said.

Considering the level of discomfort — and the brace — it seems more likely than not that Mayer is placed on the injured list Friday. Logical options to replace him on the roster include David Hamilton, Kristian Campbell, Vaughn Grissom and Nick Sogard. Mayer, who went 0-for-1 with a strikeout and walk before departing, had hit .230 with four homers, eight doubles and a .673 OPS in 43 games while admirably manning both third base and second base before Wednesday.

Mayer dealt with soreness in the same wrist in his first full professional season in 2021 at Single-A Salem.

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