The Yankees have serious interest in left-hander Jorge de la Rosa, according to a source. de la Rosa went 8-7 with a 4.22 ERA with the Rockies last season and pitched very well in the second half of the season. "There's a number of free agents out there that would interest me," Yankees general manager Brian Cashman said. "We've made a lot of phone calls and expressed interest in a number of players. How this winter plays out will dictate who we end up with."