"Until all the doctors weigh in, I'm not going to guess and speculate," Posada said in a statement released through the team. "When they give me concrete information, I'll be sure to share it with [reporters]."
Posada was placed on the 15-day disabled list on Monday, his first career appearance on the DL. The last time the Yankees played a game without Posada on their active roster was Sept. 1, 1996, at Anaheim -- according to the Elias Sports Bureau, Posada was one of five active players with 10 or more years of service who had never been on the disabled list, joining Brad Ausmus, Johnny Damon, Andruw Jones and Derek Lowe.
"He's been remarkable," Yankees manager Joe Girardi said. "Some people say that part of that might be that he didn't catch when he was younger. He was a second baseman when he signed and played his first year as a second baseman. I think it's God's blessing on his body and the work he puts in."
Girardi said that he is "optimistic" that the films will not show any major structural damage, and that Posada will be able to return to the club later this season. Until then, he has been advised to rest the shoulder completely, as Girardi warned him against sneaking into the Yankees' batting cages.
"I know he's not happy with the situation, but I think that he understands it and knows you have to be smart about it and not rush back," Girardi said. "I'm sure he'll be in our ears plenty and bothering us and getting anxious. That's what you want from a player, but we've got to make sure we hold him back a little bit."
With Posada out as well as defending MVP Alex Rodriguez (right quadriceps strain), the Yankees fielded a different-looking lineup for their series opener on Tuesday against the Tigers, kicking off a nine-game homestand.
Chris Stewart, who had his contract purchased from Triple-A Scranton/Wilkes-Barre on Monday, was to make his Yankees debut at catcher, while Morgan Ensberg manned third base and Melky Cabrera was given a day off in center field.
"It's just a test of your depth -- it's baseball," Girardi said. "You have to use all of the players you have. If you only had a nine-man roster, then you'd have the same guys every day. With our schedule, we're playing 33 games in 34 days, and you're going to see some days when guys get days off."