Cole was making just his second start since coming off the disabled list after he had right shoulder fatigue.
"We'll probably know a little bit more [Saturday]," Pirates manager Clint Hurdle said. "I don't think anybody is overly alarmed right now."
Cole threw just 80 pitches in five shutout innings, allowing one hit, walking one and striking out five, as the Pirates routed the Phillies 8-2. Cole picked up the win.
"Today, I just felt more like myself," he said.
Cole, who was the first overall selection in the 2011 draft, had been out since June 4 before returning Saturday against the New York Mets. He allowed the Mets to score five runs in four innings in a 5-3 loss.
He is 7-4 with a 3.78 ERA in 14 starts.
Information from The Associated Press was used in this report.