Arizona Diamondbacks pitcher Mark Melancon
Melancon has a mutual option for 2024 but he could elect for free agency in the winter. He is currently the only Arizona pitcher who could be a free agent, and I don't think the Cardinals will or should pursue Evan Longoria, Tommy Pham, or Lourdes Gurriel Jr., so we're left with Melancon.
The 38-year-old started this season on the IL with a shoulder injury, and after going on a rehab assignment in August, he was shut down last week before pitching a game in the big leagues this year.
If the Cardinals wanted to, they could invite Melancon to Spring Training on a minor league deal and see if he could earn his way onto the team. He was an All-Star closer just two seasons ago with the Padres, leading the NL with 39 saves, so he could bounce back in 2024 if healthy.