|Full name||César Láinez Sanjuán|
|Date of birth||10 April 1977|
|Place of birth||Zaragoza, Spain|
|Height||1.82 m (6 ft 0 in)|
|1999||→ Villarreal (loan)||3||(0)|
|* Senior club appearances and goals counted for the domestic league only.
A Real Zaragoza youth graduate, Zaragoza-born Láinez made his professional debuts with its B-side, but struggled initially to find a first-team place. In January 1999 he served a six-month loan stint at Villarreal CF, playing in three La Liga matches as the season ended in relegation.
After his return to Zaragoza, Láinez had to wait until the 2001–02 campaign to become first-choice, but his team would again be relegated. He was instrumental in the Aragonese club's immediate promotion, and subsequently helped it finish in a comfortable 12th place, also conquering the Copa del Rey after an extra time win against Real Madrid.
On 9 October 2014, Láinez returned to his lifetime club Zaragoza, being appointed manager of the reserves. On 19 March 2017 he replaced Raül Agné at the helm of the first team, who now competed in Segunda División.
- As of 12 May 2017
|Zaragoza B||9 October 2014||19 March 2017||105||54||22||29||168||101||+67||51.43|||
|Zaragoza||19 March 2017||Present||8||3||3||2||10||7||+3||37.50|||
- Galletti gives Zaragoza glory; UEFA.com, 18 March 2004
- El club de las rodillas rotas (Shattered knees society); Heraldo de Aragón, 29 July 2010 (in Spanish)
- Barcelona end season in stalemate; UEFA.com, 28 May 2005
- César Láinez, nuevo entrenador del Real Zaragoza B (César Láinez, new manager of Real Zaragoza B); Heraldo de Aragón, 9 October 2014 (in Spanish)
- César Láinez sustituye a Raúl Agné como entrenador del Real Zaragoza (César Láinez replaces Raúl Agné as manager of Real Zaragoza); Real Zaragoza, 19 March 2017 (in Spanish)
- "Laínez: César Laínez Sanjuán: Matches 2014–15". BDFutbol. Retrieved 19 December 2016.
"Tercera División (Grupo 17) 2015–16" [Tercera División (Group 17) 2015–16] (in Spanish). Futbolme. Retrieved 19 December 2016.
"Fase de ascenso a Segunda División B 2015–16" [Promotion phase to Segunda División B 2015–16] (in Spanish). Futbolme. Retrieved 19 December 2016.
"Real Zaragoza B" (in Spanish). Futbolme. Retrieved 19 December 2016.
- "Laínez: César Laínez Sanjuán: Matches 2016–17". BDFutbol. Retrieved 23 March 2017.
- "Zaragoza, no hay quinta Copa mala" [Zaragoza, no such thing as a bad fifth Cup] (in Spanish). ABC. 1 July 2001. Retrieved 7 July 2014.