That doesn't particularly mean they'll actually go to an arbitration hearing, however. Teams can negotiate with their arbitration-eligible players up until the date of their scheduled hearings, which usually fall at some point in February.
Callaspo is two years removed from free agency, and is estimated to receive roughly $3 million if his case goes to arbitration. Aybar will be a free agent after the upcoming season, and the Angels have begun extension talks with the shortstop, who could garner something close to the four-year, $33.5 million deal Howie Kendrick recently signed.
Angels general manager Jerry Dipoto declined comment when asked about those negotiations.