Trumbo has been out since April with a stress fracture in his left foot. He was tied for the National League lead with seven home runs and was second in RBI with 19 when he got injured.
Arizona acquired Trumbo from the Los Angeles Angels in December in a three-team trade also involving the Chicago White Sox. He signed a one-year contract worth $4.8 million with the team to avoid arbitration.
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Diamondbacks manager Kirk Gibson said that Trumbo, who hit a grand slam during his first rehab start with Triple-A Reno on Monday, could be activated in time for the start of Arizona's three-game series with the San Francisco Giants this weekend.
"We've had some discussions about it," Gibson said, via AZCentral.com. "There's an outside chance he could come to San Francisco, but (it's) unlikely."