Yankees captain Derek Jeter returned to the lineup Thursday for the first time since breaking his ankle during the playoffs back in October, but may have suffered another setback.
Yankees manager Joe Girardi says Jeter will be sent for a test after hurting his right quadriceps.
He indicated before the game that Jeter would be back in the lineup Friday and play shortstop.
Jeter wasted little time getting an infield hit in his first at bat, and would later score the Yankees' first run of the day.
Jeter was the designated hitter and went 0-for-4 with a run batted in.
The Yankees went on to beat the Royals 8-4.
Speaking to reporters afterward, Jeter said he did not think the quad injury came from pushing himself too hard in his season debut.
He said he felt fine otherwise, and talked about his return from the two consecutive broken ankles.
"I couldn't wait," he said. "Ever since I got hurt in October, I was thinking about the first at bat. I wanted to get back on the field. That's what I've worked extremely hard for, and I did all the rehab. Rehab is not easy. It's not fun, but the reason I did it, because I wanted to get back and I wanted to get back on the field. I'm happy I was able to get back today and hope that I'll be back out there tomorrow."
Jeter, 39, was injured last October during Game 1 of the American League Championship Series against Detroit.
He vowed to be back by Opening Day, but a second fracture was found during spring training.
Jeter played the fourth game of his rehab assignment with AAA Scranton Wednesday night, going 0-for-3 with an error.
Speaking to reporters Thursday, team manager Joe Girardi said the decision to bring Jeter back was accelerated after players Brett Gardner and Travis Hafner both suffered foot injuries during Wednesday's game against Kansas City.
"In the perfect world, he would have played Scranton today, but because of what happened last night to the two guys, we brought him back," Girardi said.
"I hear he's moving surprisingly well, so I think it's easy to say that you would expect with his injuries and his age in a double break, you'd think he'd lose a step or two or half a step. But I think he's moving extremely well," said Yankees GM Brian Cashman.
Before going to Scranton, Jeter had spent the last several months rehabilitating his ankle in Tampa, Fla.