Sources: Andrew Cashner set for AFL

Chicago Cubs right-hander Andrew Cashner will pitch in the Arizona Fall League after the season ends, according to major league sources, in an attempt to build up his arm so he can compete for a rotation spot in 2012.

Cashner made his second rehab appearance on Friday, starting the game at Double-A Tennessee and pitching one shutout inning for the Smokies against Jacksonville. He struck out one.

Cashner is expected to make one more appearance for Tennessee on Monday before being promoted to Triple-A Iowa, where he's expected to make two appearances out of the bullpen. Barring any setbacks, Cashner would then be promoted to the major leagues sometime in early September and pitch out of the Cubs bullpen.

Cashner injured his right rotator cuff in his first major league start on April 5 at Wrigley Field. He was put on the disabled list on April 8. During a rehab session on May 16, Cashner reinjured the rotator cuff and had not pitched competitively until last week.

He has made two appearances at Double-A Tennessee with an ERA of 10.80.

There are no plans for the Cubs to start Cashner in the majors before 2012, according to sources.

Bruce Levine covers the Cubs for ESPNChicago.com and ESPN 1000.