Barreto was added to the A's 40-man roster Friday.
Barreto was one of five young players added to the 40-man ahead of next month's Rule 5 draft. The top prospect in the A's organization, Barreto finished with a .284/.342/.422 line, 11 homers and 30 steals between Double-A and Triple-A last year after a slow start. He doesn't turn 21 until late February.