Despite being in a long reconstruction process, Padre was mentioned as the "under radar" protagonist in the movements of this winter in the main leagues.
Although San Diego could sign a free agent to improve his list, there is a possibility that the team gets talent in exchange for some prospects of their quoted Junior League system.
However, the name in this sense is not available and can even be described as "untouchable": Dominican Fernando Tatis ml. That's Andy Martino from SNY in New York. Martino says Padres told Mets when both teams held talks on a possible trade for Noah Syndergaard.
This attitude of Padre is not a surprise, given that Tatis Jr. 19 years old and that is the best prospect of San Diego (and second best from baseball) to the MLB Pipeline.
Director General of Padres, A.J. Preller was famous for his bold moves in the past, but it seems to be a limitation.