Mills’ contract called for his availability to be advertised to other teams and the A’s opted to take a flyer on the 29-year-old left-hander who last pitched in the major leagues in 2012 with the Los Angeles Angels. The Brewers received cash considerations in exchange for Mills.
His opt-out clause actually kicked in June 15 if another team opted to put Mills on their 25-man active roster.
According to reports, Oakland will slot Mills right into their rotation. It was reported Tuesday that lefty starter Drew Pomeranz has a fractured hand and was played on the disabled list, creating a roster spot for Mills.
The Brewers signed Mills as a free agent in January after he had been released by the Texas Rangers last July.
At Triple-A Nashville this season, Mills was 4-2 with a 1.56 ERA and 0.920 WHIP in 14 appearances, 12 of them starts, and 75 innings, striking out 77.
Success at the big-league level has been more fleeting for Mills, who in parts of four seasons with the Toronto Blue Jays and the Angels has a 7.76 ERA and 1.706 WHIP in 15 appearances (10 starts) covering 53.1 innings in his career.
He was originally drafted by Toronto in the fourth round of the 2007 first-year draft out of the University of Arizona.