Cespedes, 27, was 3-for-9 with a home run and four RBIs in three rehab games with Triple-A Sacramento.
He was batting .200 with three home runs and seven RBIs in 11 games before his injury. The A's are 8-2 with Cespedes in the lineup, compared to 5-10 without him.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.