Career
He has previously played for Cardiff City and has also represented the Uruguay U20 national team After graduating from Nacional"s youth system, Amondarain was loaned to Progreso in 2012 summer. Progreso also kept an agreement with Nacional by receiving a part of the sale if the player was sold.
Amondarain made his professional debut on 7 October 2012, in a 0–2 away defeat against Fénix.
He finished the season with 18 appearances, and returned to Nacional. On 30 August 2013, Cardiff City confirmed the signing of the free agent Amondarain after an impressive trial period earlier in the summer.
He signed a four-year deal with the club after a one-month trial basis. Amondarain"s contract with Cardiff was terminated by mutual agreement on 24 June 2015.
On 21 November he joined Elche CF"s reserve team on a trial basis, signing a contract in December being registered in the first team in January.