According to Jon Heyman, the Yankees have signed journeyman lefty reliever Rex Brothers to a minor league contract. I assume he received an invitation to Spring Training. Brothers is the third depth player the Yankees have signed to a minor league deal so far this offseason, joining catcher Ryan Lavarnway and infielder Gio Urshela.
Brothers, who turns 32 today, was a pretty big deal with the Rockies a few years ago, but injuries and control issues have hampered him this last few years. This past season he pitched to a 6.20 ERA (4.