Sergio Guerrero Romero (born 13 January 1999), sometimes known as Mini,[2] is a Spanish footballer who plays as a midfielder for FC Cartagena.

[3] He scored his first senior goal on 31 October in a 3–1 home win against Antequera CF, and established himself as a regular starter during his loan spell.

He made his first team – and professional – debut on 8 May 2021, replacing Joaquín Muñoz in a 1–1 away draw against RCD Mallorca in the Segunda División.

[4][5] On 9 July 2021, Guerrero moved to another reserve team, Atlético Madrid B of the Tercera División RFEF.

[6] He became and undisputed starter of the side in their two consecutive promotions, becoming team captain in the process and being an unused substitute with the main squad in two UEFA Champions League matches.