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Yost said neither he nor his players wanted to keep playing. Price felt the same way.

“You can’t find it in your heart to go out there and play,” he said.

Oakland pitcher Brandon McCarthy, who had emergency surgery after he was struck in the head by a line drive in September 2012, urged caution in a post on Twitter.

“all reporting at this point means zilch, until he gets a scan,” he said in a tweet.

Chapman, who throws a 100 mph fastball, had walked four Royals in the inning before being injured.

The two-time All-Star had 38 saves for the Reds last season.

When reporters walked into the Royals clubhouse, third baseman Mike Moustakas asked a team official to request that they leave.

“No one wants to talk,” Moustakas said.

In January, Major League Baseball approved a protective cap for pitchers following several terrifying scenes similar to this one in the last few years, including Toronto’s J.A. Happ, who sustained a skull fracture.

The heavier and bigger hats were available for testing during spring training on a voluntary basis, but the cap apparently would not have helped Chapman in this case.

“I know this isn’t uncommon as we would like it to be, but it was frightening,” Price said. “Certainly frightening.”