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Cahill (calf) has been progressing slowly in his recovery, Jake Crouse of MLB.com reports.
Cahill had resumed running in late June, but manager Derek Shelton said Saturday that the right-hander hasn't been progressing as quickly as the Pirates had hoped. The 33-year-old was transferred to the 60-day injured list Friday, so he'll be sidelined until at least mid-August.
