Alejandro Sebastián Romero Gamarra (born 11 January 1995), nicknamed Kaku, is a professional footballer who plays as an attacking midfielder or winger for Emirati club Al Ain and the Paraguay national team.

[1] On 14 December 2014, Kaku helped Huracán return to the top flight after three seasons in the Primera B Nacional, scoring the decisive second goal in a 4–1 victory over Atlético Tucumán.

[2] With the promotion to the top flight, Huracán concluded a very successful season, having won the 2013–14 Copa Argentina a few weeks prior in a penalty shoot-out over Rosario Central with Kaku appearing as a second-half substitute.

[4][5] On 1 March 2016, Kaku led Huracán to a historic victory in the Copa Libertadores over Peñarol at the Estadio Centenario, scoring the lone goal in the 1–0 triumph.

[12] On 23 December 2017, it was announced by Huracán that they had agreed a deal to transfer Kaku to New York Red Bulls of Major League Soccer for a fee of $6.25 million.

[23] On 17 February 2021, Romero Gamarra's former club New York Red Bulls and Major League Soccer sought arbitration against Kaku and the MLS Players Association for breach of contract.

[25] On 12 May 2021, Major League Soccer and New York Red Bulls filed a petition in United States federal court seeking to have the arbitration decision enforced.