The team appears concerned that Bird's soreness is related to the foot/ankle injury that required surgery last season and sidelined Bird for all but 48 games in 2017.
"I'm worried about it, to be honest," general manager Brian Cashman told reporters. "I'm not sure what we're dealing with. But when Greg ... when he can't tee it up, that's a problem for us because he's a vital member of our organization."
Cashman added that Bird first informed the team of his discomfort late in Friday's game against the Boston Red Sox.
" might have been -- I don't want to put words in his mouth -- but he said that as he ramped up baseball activity to nine innings it started to rear its ugly head," Cashman said. "He felt it by the end of the game, and I guess it carried over into [Saturday's] pregame. But he didn't say anything to us about it because he kind of figured it was something that he felt at that point was something that would go away, I guess."
Bird fouled a ball off of his right ankle in spring training last year and played through the injury for a month -- batting .100 with one homer and three RBIs in 19 games -- before ultimately having surgery to remove a bone from the ankle. The 25-year-old batted .253 with eight homers and 25 RBIs in 29 games after returning.
Heading into 2018, Bird is expected to fill a key spot in the lineup as a left-handed bat between power-hitting righties Aaron Judge, Giancarlo Stanton and Gary Sanchez. However, Bird has struggled at the plate this spring, going 8-for-52 (.154) with 16 strikeouts and just one home run in 18 games.
"We'll wait and see what the pictures say, and hopefully we can paint a clearer picture of what's going on," manager Aaron Boone said. "...You always feel bad when somebody's worked hard to put themselves into a position, and you understand what we think of him as a player and what we believe his ceiling is.
"So the biggest thing for him to go out and prove that will be his health. And we think that's the only thing in his way right now to becoming a premium player."
--Field Level Media