[3] He was immediately inserted in the first-team setup, appearing in 25 Segunda División games in his first season, starting with a 2–1 home loss against CD Numancia on 29 August 2009 in which he came on as a half-time substitute for Roberto Lago.

[6] He started in all 34 matches he appeared in the 2011–12 campaign, as the side finished second and returned to La Liga after five years; he made his debut in the competition on 18 August 2012, in a 0–1 home defeat to Málaga CF.

[7] On 9 January 2013, during a 4–0 Copa del Rey loss at Real Madrid (5–2 aggregate), Mallo – who was not being challenged – suffered an anterior cruciate ligament to his left knee, going on to be sidelined for the rest of the season.

[16] On 15 August that year, his added-time foul on Luis Suárez in a 2–1 home loss to Atlético Madrid caused a brawl which resulted in dismissals for himself, opponent Mario Hermoso and Atléti fitness coach Óscar Ortega.

[20] Signed by former Celta manager Eduardo Coudet, he made his debut five days later as a 62nd-minute substitute for Vitão in a 1–0 home loss to Fortaleza Esporte Clube, becoming the Porto Alegre club's first European in over a century and first Spaniard.

[28] On 30 January 2024, Mallo was ordered to stand trial in Barcelona's Criminal Court number 19 for allegations that he inappropriately touched the breasts of a woman who wore a parakeet costume while working as an Espanyol mascot.

[29] The accuser, who remained anonymous and used the alias "Ms. Ana," previously testified about the incident while appearing before the Court of First Instance and Instruction Number 2 of Cornellà de Llobregat on 27 June 2019.