The A's selected Robnett, 25, in the first round (26th overall) of the 2004 draft. In five seasons in Oakland's minor league system, he has hit .256 with 14 doubles, 58 home runs and 252 RBIs in 449 games. He was limited to 82 games last season after surgery to remove a rumor from his stomach.
Sellers, 23, was taken in the sixth round of the 2005 draft. In four seasons in the A's minor league system, Sellers has hit .256 with 70 doubles, 15 triples, 15 home runs and 145 RBIs in 417 games. He has played 285 games at shortstop and 128 games at second base.
Robnett has been added to the Cubs' 40-man roster and will report to major league spring training. Sellers will report to the minor league camp.
ESPN: Wuertz to A's for 2 fielders
ESPN.com reports RHP Michael Wuertz has been traded to the Oakland Athletics for outfielder Richie Robnett and infielder Justin Sellers.