|Full name||Mario Gutiérrez Cotelo|
|Date of birth||10 February 1975|
|Place of birth||La Felguera, Spain|
|Height||1.81 m (5 ft 11 1⁄2 in)|
|1996–1997||→ Badajoz (loan)||36||(1)|
|* Senior club appearances and goals counted for the domestic league only.
Born in La Felguera, Asturias, Cotelo began his career at local Sporting de Gijón, and played for its B-team during his first two seasons as a senior. During 1993–94 he appeared once for the main squad and, after a loan to Segunda División side CD Badajoz, would become an important player with the latter.
After four full seasons with Gijón, Cotelo returned to La Liga with Sevilla FC, but would only appear five times for the Andalusians during one 1/2 seasons, moving to UD Las Palmas in January 2003. In the 2003–04 campaign he was a key element in Getafe CF's first ever promotion to the top flight, and went on to appear in 93 league games combined in the following three years.
Used sparingly throughout 2007–08, Cotelo also played in six incomplete UEFA Cup contests in the Madrid team's quarterfinal run. In the next season he featured even less (two matches, four minutes total), and was released at its closure.
Not being able to find a new club, Cotelo retired from the game in early 2010, at the age of 35. He played a total of 349 matches the country's two major divisions combined.
On 20 August 2015, Cotelo returned to Sporting to work as a match delegate.
- "Quini, tras asumir su nueva responsabilidad institucional: "Quiero morirme en el Sporting"" [Quini, after taking over new institutional responsibility: "I want to die in Sporting"] (in Spanish). Sporting Gijón. 20 August 2015. Retrieved 29 February 2016.