Pitcher Fabio Castro has been optioned to Triple-A Pawtucket and outfielder Darnell McDonald has been re-assigned to minor league camp, according to WEEI's Alex Speier.
Both these guys are players we may at some point this season with the Red Sox. Castro is a deep option out of the bullpen, but he could give the Sox some quality innings at some point. We'd have to see a few injuries, though. McDonald is going to see most of his time in Pawtucket, but if there are any injuries to the Sox's core three outfielders, McDonald and Josh Reddick will see big league time.