Iván Calero

Atlético Madrid

Born in Parla in the Community of Madrid, Calero graduated from local Atlético Madrid's youth system, and made his senior debut with the C-team in the 2011–12 campaign, in Tercera División. He appeared regularly in the following season, also making his senior debut with the reserves in Segunda División B on 9 September 2012, replacing Pedro Martín after 60 minutes of a 3–1 loss at Leganés. On 20 February 2013, Calero was called up to the main squad by manager Diego Simeone for a UEFA Europa League match against Rubin Kazan. However, he remained unused in the eventual 1–0 away win. On 19 May 2013, in only his second match with the reserves, Calero scored his first senior goal, netting the last of a 4–1 win at Rayo Vallecano B. He was definitely promoted to the B-team in the 2013 summer, and scored four goals in 29 matches in 2013–14.

Derby County

In July 2014, Calero went to Championship club Derby County, and signed a two-year deal with the Rams on 18 July. Manager Steve McClaren said: "He's a young player with excellent pedigree. We are really pleased that he sees his future at Derby County". Calero played his first match as a professional on 26 August, replacing Simon Dawkins for the last 20 minutes of a League Cup victory over Charlton Athletic at Pride Park, netting the game's only goal in the 87th minute. On 14 September he played in the league for the first time, replacing John Eustace for the final 13 minutes of a 1–1 draw away to…

On 23 November 2010, Calero was called up to the Spain under-16s. He subsequently represented the under-17, under-18 and under-19 levels.

As of 16 June 2023

Calero's father Julián had a lengthy career in coaching and management, including as assistant to Fernando Hierro for the Spain national team at the 2018 FIFA World Cup.