According to assistant general manager David Forst, Russell played four innings in the field Wednesday and had two at-bats. He'll remain rehabbing in Arizona until cleared to rejoin a Minor League club.
"We won't have any other updates on his progress or expected return to action until he is ready to leave the extended program and join a full-season club," said Forst through e-mail.
There is no timetable on when that will be, but Russell's return to the field is encouraging for an organization that has long forecasted him to be the A's starting shortstop in 2015, following Jed Lowrie's expected departure via free agency.
Russell, 20, has compiled a .306 average through 167 games in the Minors, hitting .269 with 17 home runs and 21 stolen bases in his first full professional season last year, the majority of it spent at Class A Stockton.
Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. Aaron Leibowitz is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.