26 already is out. Out before 10 was. And with any luck, 21 will be retired within a few years, also (depending on when he decides to hang them up) I would immagine that its kinda unofficially retired right now anyways, just like 23. I doubt anyone even thinks about wearing those numbers. Well, since the Cubs have retired exactly three numbers in over 100 years of existence, I doubt Sosa's # gets retired until he makes the Hall of Fame. Santo is the one exception to this rule so far (and I think his was only retired because of his continued work with the club + his failing health). Sandberg's will be retired at the start of next season I would imagine. #21 will be available for at least the next 6 or 7 years. Don't forget about 31 being on the flagpole one day. Twice.