Castellanos, a two‑time All‑Star who spent four seasons with Philadelphia, will likely slot into first base as the Padres look to fill the vacancy left by Luis Arraez. The veteran will be paid only the $780,000 minimum, while Philadelphia will cover the rest of his $20 million contract.
Canning and Márquez could vie for the two open spots in San Diego’s starting rotation, which is currently anchored by Pivetta, Musgrove and King. The moves come after the Padres lost Dylan Cease, closer Robert Suarez and saw Yu Darvish undergo elbow surgery.