The Cardinals and their catcher are finalizing a one-year deal Monday night for the coming season, two sources confirmed.
Later Monday evening, Molina shared a video of Cardinals highlights on Instagram and these two words: "I'm back."
The contract does not include an option.
Molina, 38, and the Cardinals both felt they were close to an agreement before Molina went to the Caribbean Series to compete for Puerto Rico's representative team. The championship was Saturday, and Molina's return home spurred the final stages of his return to the Cardinals.
It will be Molina's 18th season with the only club that he's known.