The Padres announced that they acquired right-hander Tyson Ross and infielder A.J. Kirby-Jones from the A's for infielder Andy Parrino and left-hander Andrew Werner. None of the four players have enough service time to be arbitration eligible.

Ross started 13 games and made five relief appearances for the Athletics this past season. The 25-year-old posted a 6.50 ERA with 5.6 K/9 and 4.5 BB/9 in 73 1/3 innings. The 2012 campaign was Ross' third at the MLB level. Ross is the older brother of Joe Ross, the right-hander selected by the Padres in the first round of the 2011 draft.

Kirby-Jones, 24, played at Class A this past season. The first baseman has a .248/.384/.448 batting line over the course of his three-year minor league career.

Parrino appeared in 55 games for the Padres in 2012, playing shortstop, second base, third base and right field. The 27-year-old switch hitter posted a .207/.316/.276 batting line in 138 plate appearances.

Werner debuted with the Padres this past season, starting eight games at the MLB level. The 25-year-old posted a 5.58 ERA with 7.8 K/9 and 3.1 BB/9 in 40 1/3 innings with San Diego. He signed with the Padres as an amateur free agent two years ago.