Clint Frazier said there was only one true way to test his oblique during his four-game rehab with Double-A Trenton.

Swing for the fences.

“I was swinging as hard as I could to make sure I was good,” said Frazier, activated yesterday from the disabled list, where he had been since Aug. 9 with a left oblique strain. “I needed to clear my mind of any doubt.”

Frazier, whom Joe Girardi said will be in the lineup Tuesday night and perhaps Wednesday against the Rays, went 2-for-17 with 10 strikeouts during the four games. But he felt nothing in the oblique, significant in that such injuries are notoriously tricky in healing.

“I swung and missed enough to realize I’m physically good,” he smiled. “I had to know. I didn’t want to go up there and baby it. I swung as hard as I could as many times as I could and there’s no doubt in my mind now that my oblique is healed.”

Frazier debuted impressively, homering and doubling in his first game July 1 at Houston, the beginning of a 20-game stretch in which he had a .860 OPS. But the rookie slumped before his DL stint, a 5-for-33 skid dropping his slash line to .243/.274/.477.

Bird a scratch

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Greg Bird was scratched from Monday night’s lineup with what the Yankees called “lower back tightness.” Bird said he felt spasms after taking batting practice.

“Give it a few days, see where I’m at,” Bird said. “It is [frustrating], I’m not going to lie.’’

Good news out of Florida

Besides having their minor- league complex in Tampa, the Yankees have a fair number of coaches and players with family and homes in the area hit by Hurricane Irma. “We were very worried,” Girardi said. “It seems like everyone came out all right.”

Hicks hopeful

Aaron Hicks (left oblique) hasn’t started swinging a bat and is limited to doing range of motion and agility exercises. Still, “I feel like I’ll be able to play before the season’s over,” he said.