Alejos was invited to try wheelchair basketball around 2002 by a neighbour, who was the president of the team in Vigo.

He moved to Australia for family reason in 2010 and played for the Queensland Spinning Bullets in the Australian wheelchair basketball league from 2010 to 2015, with the exception of the 2012 season.

With the goal towards 2016 Rio Paralympics, he returned to Europe and split his season between playing for Gran Canaria and Vigo.

[1] Alejos was part of the Spanish team in 2016 Summer Paralympics, winning a silver medal in the competition.

[2] He represented Spain in the 2018 Wheelchair Basketball World Championship,[3] finishing in fifth place.