Boscan was optioned to Triple-A Indianapolis on Saturday, Stephen J. Nesbitt of the Pittsburgh Post-Gazette reports.
Boscan was hit hard in his outing against the Angels on Friday, allowing two earned runs with four hits and four walks while recording just one strikeout in 3.1 innings. The Pirates also optioned Rob Scahill on Saturday and recalled relievers Cory Luebke and Curtis Partch.