According to him, he was prepping for a series finale after he received surprising news from CBS ahead of Season 12’s renewal. “We were told pretty early on, I think before Thanksgiving, that our season finale would be the last two episodes and would air back-to-back, which I immediately took as they’re planning to wrap up the series,” he explained.
Much to his surprise, the network renewed the show for another season. And once again, the fate of the show is up to CBS.
Source: https://www.distractify.com/p/blue-bloods-canceled