[2][5][6][7][8] In the men's visually impaired 4 × 100 meter relay, he competed with Gerard Descarrega Puigdevall, Xavier Porras (T11), and Maximiliano Óscar Rodríguez Magi (T12) and finished in Spanish record national time of 45.45 seconds.

[9][10] Prior to the start of the London Games, Parejo trained with several other visually impaired Spanish track and field athletes in Logroño.

[2][12] He wore bib number 2262 and ran with guide runner Joan Borrisser Roldan in the 100 meter event in London.

[7][16] In July 2013, he participated in the 2013 IPC Athletics World Championships,[17] making the finals for the men's long jump T11.

[18] He was also a member of the men's 4 × 100 meter relay team along with Maxi Rodríguez, Xavi Porras and Gerard Descarrega.