According to Ken Rosenthal, the A’s and Diamondbacks have had some discussions about a deal involving Yoenis Cespedes:
— Ken Rosenthal (@Ken_Rosenthal) December 4, 2013 
Athletics, Diamondbacks Discuss Cespedes by Matt Stein
Both teams now say they were not comfortable with particular deal. For one thing, #Athletics  only would trade Cespedes for monster return.
— Ken Rosenthal (@Ken_Rosenthal) December 4, 2013