Rafael Devers is displeased with the Boston Red Sox asking him to play first base with Triston Casas expected to miss the rest of the season after suffering a ruptured patellar tendon in his left knee.

Boston Red Sox star Rafael Devers isn’t afraid to stand his ground, even if it means publicly taking on his bosses. Devers blasted Red Sox chief baseball officer Craig Breslow on Thursday and reiterated he won’t move to first base. Boston lost first baseman Triston Casas to a season-ending knee injury last weekend.

Speaking with reporters for the first time since Triston Casas was ruled out for the season after rupturing his left knee tendon and undergoing surgery, Devers said on Thursday that Red Sox management approached him about the idea of filling in as Boston’s first baseman.