Burnett passed the physical and mlb approved the trade. Done deal.
— Jon Heyman (@JonHeymanCBS) February 19, 2012
Now that the trade is official and approved by MLB, a corresponding roster move must be made by the Pirates to make room for A.J. Burnett on the 40-man roster. The likely candidates seem to be Duke Welker or Gustavo Nunez.
I’ll update this post to reflect the move when it is announced.