Yankees first baseman Anthony Rizzo returns to the dugout after...

Yankees first baseman Anthony Rizzo returns to the dugout after grounding out against the Dodgers during the sixth inning of an MLB game at Yankee Stadium on June 8. Credit: Kathleen Malone-Van Dyke

Even before learning the results of an MRI that would not come until the next day, Aaron Boone on Sunday spoke like a manager who understood that he will be missing a significant player for some time to come.

“He’s in some pain in that lower arm in a number of places,” Boone said late that night of Yankees first baseman Anthony Rizzo.

In the seventh inning of the Yankees’ 9-3 loss to the Red Sox, Rizzo collided with Boston pitcher Brennan Bernardino on a bang-bang play at first base before crashing to the ground and landing on his right arm.

Boone’s concerns were well founded. According to a source, an MRI on Monday revealed a fracture in the arm that is certain to keep Rizzo out a minimum of a month and probably longer than that.

“When he didn’t get up right away, I could tell he was in some pain,” Boone said on Sunday. “Obviously, concern there and then just certain movements, even out there, kind of knew right away he was in some pain.”

Rizzo, in a season-long slump, had shown signs in the last week, mostly in the form of more consistent hard contact, of coming out of it.

He has five hits in 48 at-bats this month and is hitting .223 with eight homers and a .630 OPS through 70 games.

Even before the injury, there had been discussions behind the scenes about the trade deadline and the potential need for corner infield help. In the immediate future, expect DJ LeMahieu to get most of the playing time at first, with Oswaldo Cabrera getting the occasional nod. Backup catcher Austin Wells has done a bit of pregame work at first all season and is an emergency option.

Among other potential options — neither of whom are on the 40-man roster — are minor-leaguers TJ Rumfield and Ben Rice. The latter was recently promoted to Triple-A Scranton/Wilkes-Barre.

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