"Brown (back) had an unsuccessful bullpen session on Sunday, and will not return from the DL to start Thursday as originally hoped, the Yankees' official site reports.
Brown didn't have any physical problems, but manager Joe Torre and pitching coach Mel Stottlemyre weren't satisfied with the pitches he was making: "He was OK physically, but he had to work a little harder today than he did the other day when the ball came out of his hand easier," Torre said. "Nothing hurt, he just didn't have the life that he had the last time out. He wasn't pleased with it, so we're looking at another bullpen in a couple of days." Brad Halsey will start Thursday against Pedro Martinez."
I got this off Rotowire today.