The Padres announced they’ve optioned right-hander Dinelson Lamet to Triple-A El Paso. The move clears an active roster spot for Robinson Canó, whose previously-reported major league contract has been made official. San Diego already had an opening on the 40-man roster.

It’s a disappointing and somewhat surprising development for Lamet, who’s only two years removed from a fourth-place finish in NL Cy Young award balloting. He made 12 starts and threw 69 innings of 2.09 ERA ball that season, punching out an excellent 34.5% of batters faced along the way. That seemed to cement him as a key piece of the organization’s long-term rotation, but he dealt with arm issues during the postseason that set him off track.