Pitchers Lance Pendleton, Scott Proctor and Raul Valdes joined the staff, as did infielder Brandon Laird and outfielder Chris Dickerson. Of the group, only Proctor and Valdes have not been on the Yankees' roster this year.
Proctor, 34, spent four years with the Yankees beginning in 2004, compiling a 4.29 ERA in 190 appearances. He pitched seven innings at Triple-A Scranton/Wilkes-Barre this season, posting a 2.57 ERA.
"It's nice. You always love to come back to the team that you kind of broke into the league with," said Proctor, who was released by the Braves in August. "To do it at this time of year in this series is kind of neat. To come full circle, it's been a long road, but I'm only looking forward from here."
Valdes, 33, joins the Yankees as a second left-handed reliever behind Boone Logan. Valdes made seven appearances this year with the Cardinals (3.38 ERA) and was claimed off waivers by the Yankees on Aug. 16.
"He's a guy that you know can help out, and you don't have to use your regular guys in certain games," manager Joe Girardi said. "So we'll see. I don't really know a whole lot about him, but he is left-handed."
To make room on the 40-man roster, the Yankees recalled outfielder Justin Maxwell from Scranton/Wilkes-Barre and placed him on the 60-day disabled list, and designated right-hander Ryan Pope for assignment.