The 27-year-old had previously been on loan at Huddersfield Town but was not one of the more obvious names linked with the Whites such as Kyle Lafferty perhaps.
But Carayol made an immediate impression on Saturday, capped by his 45th-minute block-buster, and the wide man often provided good deliveries into the box.
He could be just the tonic for Chris Wood when the striker returns to the side.