The only free agent reliably associated (by that I mean multiple references on MLBTR) with the Giants has been Nicholas Castellanos. An OF and DH with the Tigers since 2011 he was traded to the Cubs in mid-season and performed extremely well (1.002 OPS and 37 XBH in 51 games). That raised his stock quite a bit although he was already a good player (2.7, 2.9, and 4.7 bWAR 2016-2018), if better known for his bat than his glove. He'll be 28 in March and has played in almost 900 games and amassed over 3600 PAs.
Nicholas Castellanos, anyone?
