OAKLAND -- On the final day for clubs to set their 40-man roster, the A's on Friday added outfield prospect Jermaine Mitchell and elected to outright right-hander Evan Scribner and outfielder Cedric Hunter to Triple-A Sacramento.

By placing Mitchell on the 40-man roster, the A's have protected him from the Rule 5 Draft, to be held Dec. 8 at the Winter Meetings in Dallas. The move also ensures Mitchell of his first invite to big league camp.

Mitchell enjoyed a breakout 2011 season in the A's organization, batting .355 at Double-A Midland before earning a July 3 promotion to Sacramento, where he posted a .302 average with 14 doubles, three triples, five home runs, 28 RBIs and 13 stolen bases in 56 games.

The 27-year-old outfielder, a former fifth-round Draft pick by the A's in 2006, recently underwent knee surgery and likely won't be ready by season's start, but it's likely he'll play a prominent role in Oakland's outfield mix once healthy.

Scribner and Hunter were both claimed off waivers from San Diego on Oct. 25. Their departure from the 40-man roster, combined with the addition of Mitchell, leaves the A's with one open slot.

Choice finishes off impressive AFL season

OAKLAND -- Arizona Fall League action concluded this week, with several players in Oakland's organization posting impressive results.

Top outfield prospect Michael Choice, the club's No. 1 pick in the 2010 Draft, finished with a .318 average, six home runs and 18 RBIs -- along with a 1.090 OPS -- in 66 at-bats spanning 17 games for the Phoenix Desert Dogs.

Leading the team in at-bats was fellow outfield prospect Grant Green with 107. He posted a .290 average with five homers, nine doubles and 19 RBIs while also progressing in his transition from shortstop to center field.

On the mound, right-hander Tyson Ross made seven starts, going 1-3 with a 5.94 ERA. Reliever Andrew Carignan, who, like Ross, spent time in Oakland this year, made 12 appearances, compiling a 6.57 ERA while striking out 16 in 12 1/3 innings.

A handful of other A's players are still in action in the Caribbean Winter Leagues, including first baseman Brandon Allen and pitchers Fautino De Los Santos, Graham Godfrey and Jordan Norberto.