Giants designate Jarrett Parker for assignment, add Derek Holland

Derek Holland — current co-ace of the Giants, give or take — was officially added to the 40-man roster on Monday. What was once a contested roster spot became a given after the injuries to Madison Bumgarner and Jeff Samardzija, and his solid spring didn’t hurt matters. To make room for him, however, the Giants designated Jarrett Parker for assignment.

Parker was out of options and would have been designated for assignment anyway if he didn’t make the 25-man roster, and the pitching injuries sealed his fate. He’ll have to clear waivers to return, which isn’t completely farfetched, considering that all 30 teams are in the middle of a roster crunch right now. But even if he returns to the…