Gibson (2-2) earned the win against the Diamondbacks on Wednesday, allowing one run on five hits and two walks over six innings while striking out six.
Gibson (1-1) took the loss Sunday against the Marlins, allowing seven runs on seven hits and a walk while striking out five over six innings.
Gibson allowed three runs on three hits and struck out two over two innings in his first Grapefruit League appearance of the season.
Gibson reached a one-year deal Tuesday with the Cardinals, Bob Nightengale of USA Today reports.
Gibson will be available out of the bullpen in Game 3 of the ALDS on Tuesday versus the Rangers, Danielle Allentuck of TheBaltimoreBanner.com reports.
Gibson did not factor into the decision Saturday, allowing seven hits and one walk over five scoreless innings against the Red Sox. He struck out four.
Gibson (15-9) earned the win Sunday, allowing one run on five hits and one walk over seven innings against the Guardians. He struck out four.
Gibson did not factor into the decision Tuesday, allowing three runs on five hits and two walks over 4.2 innings in a 9-5 victory over Houston. He struck out five.
Gibson (13-8) took the loss Wednesday, allowing seven runs on nine hits over 4.1 innings against the White Sox while striking out two.
Gibson (11-6) allowed three runs on four hits and a walk while striking out nine over seven innings to earn the win Saturday over the Mets.