 Alquiros was part of the Philippines U-23 squad that competed in the 2015 SEA Games.In December 2017, he took part at the 2017 CTFA International Tournament though the squad that played in the friendly tournament in Taiwan was mentored by Marlon Maro in lieu of regular head coach Thomas Dooley.Alquiros made his debut for the Philippines in a 1–0 loss against Timor Leste.