Marcos Alonso
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Marcos Alonso Mendoza (Spanish pronunciation: ; born 28 December 1990) is a Spanish professional footballer who plays as a left back or a wing back for Premier League club Chelsea and the Spain national team.

He started his career with Real Madrid, but went on to make his name with Bolton Wanderers in England and later with Fiorentina in Italy. His success at the latter club led Chelsea to sign him for an estimated £24 million in 2016.

Alonso made his full debut for Spain in March 2018.

Born in Madrid, Alonso joined Real Madrid's youth academy as a child, going on to represent every youth side in the following years. In 2008, he reached Real Madrid Castilla which competed in Segunda División B, and first appeared for the reserve team on 22 February 2008, playing the entire match in a 0–1 home loss against AD Alcorcón.

On 11 December 2009, Alonso was first summoned by the main squad – coached by Manuel Pellegrini – for a La Liga match at Valencia CF. Eventually, he did not make the final list of 18, and his debut arrived on 4 April of the following year as he came on as a substitute for Gonzalo Higuaín in the 90th minute of a 2–0 win away to Racing de Santander.