New Reliever for White Sox?

Apparently the White Sox have been in talks with Takashi Saito. He ended last season with an ERA of 2.43. They say this would make it easier to get rid of Bobby Jenks. The Braves and the Mets have also expressed interest in Saiko. Again, I am going to ask this once more, where are the White Sox's minor leaguers? If we are going to continuously sign older players why do we even have a minor league(s)?