Alejandro Villanueva is NFL's top-selling jersey since standing for anthem

(FOX NEWS) - Sales of Pittsburgh Steelers offensive lineman Alejandro Villanueva's jersey are spiking Monday, hours after the former Army Ranger-turned-NFL player was the sole member of his team to exit the locker room for the pregame rendition of the national anthem.

Over the last 24 hours, Villanueva is the top-selling NFL player in terms of jerseys, T-shirts and other merchandise on the NFL Shop, according to Fanatics, which operates NFL Shop, the league's online store. A company spokesman did not provide specific sales data.

Villanueva was the only Steelers player to emerge from the locker room on Sunday during the playing of the "Star-Spangled Banner." The 6-foot-9 offensive tackle stood just outside the tunnel with his hand on his heart, in an image that quickly went viral on social media.

The rest of the Steelers' roster opted to remain in the locker room after Trump called on NFL owners to fire players who knelt during the national anthem. Dozens of NFL players took part in demonstrations on Sunday, while league officials and most of the 32 team owners expressed solidarity with their actions.