Yankees 1B Greg Bird and 2B Starlin Castro are not ready to be called up as they need more playing time in Triple-A.
According to manager Joe Girardi, Bird has been "swinging great," but the Yankees need to ensure he can play in back-to-back games.
"Part of it, though, is we've got to make sure he's ready to go back-to-back every day in the field and play three or four days in a row," Girardi told The Post's Dan Martin.
Bird is 8-for-15 with two homers, two doubles, and four RBI in his last four games.
Castro, who is nursing his second hamstring injury on the season, has played in four games with Triple-A Scranton/Wilkes-Barre. Girardi said, "we're happy with the way he's progressing. We've got to make sure he's running fine and that there's no pain and no restrictions."
Castro is 4-for-15 with an RBI and two runs scored in those four games.