Manager Clint Hurdle said Kontos was unavailable Sunday due to lower-body discomfort, Rob Biertempfel of the Pittsburgh Tribune-Review reports.
Kontos will be reassessed in Pittsburgh on Monday, after which there should be a clearer idea of what he's dealing with. The 32-year-old owns a 1.80 ERA, 0.60 WHIP and 7:1 K:BB through five innings with his new club.