Phillies pitcher Kevin Slowey allowed six runs (five earned) on six hits in two innings while striking out two and giving up two home runs in Monday's 18-4 loss to the Pirates.
Slowey remains a candidate for the No. 5 spot in the rotation, but Sean O'Sullivan, who was reassigned to minor-league camp earlier this month, is scheduled to start Tuesday and is the favorite to take the mound the first time the Phillies need a fifth starter, MLB.com reports.
The Phillies are also looking outside the organization for rotation help, but "it's likely to be an internal candidate," general manager Ruben Amaro Jr. said.
If the Phillies do add someone, it'll likely be via a minor trade or through waivers.