Whelan was designated for assignment to make room for Hiroki Kuroda on the 40-man roster. The former college catcher had a breakout season as the Scranton/Wilkes-Barre closer last season, finally cutting down on his walks to finish with a 2.75 ERA with 54 strikeouts and 14 walks in 45 appearances.
He made just two appearances in the big leagues. He walked four batters and got just two outs in his debut, but he pitched again two days later and pitched a scoreless, hitless inning.
Whelan is the last piece remaining from the 2006 Gary Sheffield trade. Consider him additional relief depth this season.