Alejandro Romero Gamarra

New York Red Bulls 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. After resolving various issues that held up the transfer, on 16 February 2018, it was announced that he had signed with New York. Red Bulls also sent $50,000 of General Allocation Money to Atlanta United, who owned his discovery rights. On 1 March 2018, Kaku made his debut for New York in a 2–0 victory over Olimpia in the CONCACAF Champions League. On 10 March 2018, he assisted Ben Mines on the opening goal of the match on his Red Bulls league debut in a 4–0 victory over Portland Timbers. On 13 March 2018, Kaku scored his first goal for New York in a 3–1 victory over Club Tijuana in the CONCACAF Champions League, helping the club advance to semifinals of the Champions League for the first time. On 14 April 2018, Kaku scored his first league goal for New York in a 3–1 victory over the Montreal Impact. On 28 April 2018, Kaku helped New York to a 3–2 victory over LA Galaxy, assisting on two goals and scoring the game winner with an 84th-minute penalty-kick goal. The following week, 5 May 2018, Kaku opened the scoring for New York in a 4–0 derby victory over New York City, he also assisted on two other goals. On 6 December 2018, Kaku was named the New York Red Bulls Newcomer of the Year for 2018 after leading the team in assists throughout the season.

Al-Taawoun On 1 February 2021, it was announced by Al-Taawoun of the Saudi Professional League that they had agreed to a transfer for Kaku. 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. In April 2021 arbiter Shyam Das ruled against the MLSPA and Kaku and found that New York Red Bulls and Major League Soccer had exercised their unilateral contract option on Kaku prior to 31 December 2020. 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. On 22 July 2021, MLS and New York Red Bulls filed suit in United States federal court against Kaku's agent Scott Pearson and Pearson's company Argentine Futbol Tours LLC, alleging "tortious interference" in Kaku's move to Al-Taawoun and seeking in excess of $6 million in damages. On 16 September 2021, MLS and New York Red Bulls voluntarily dismissed their suit against Pearson.

International career Kaku was born in Argentina to Paraguayan parents. He was selected by Argentina's U-20 manager, Humberto Grondona to participate in the 2015 FIFA U-20 World Cup in New Zealand. On 16 May 2018, Kaku announced his desire to file a one-time switch request with FIFA to play for Paraguay. The move was approved by FIFA on 23 May 2018, and he was immediately called up to the Paraguay national team for a friendly against Japan. He made his competitive debut for Paraguay on 12 June, as a substitute in the second half of the friendly match against Japan.

On 1 June 2026, he was named by head coach Gustavo Alfaro in Paraguay's 26-man squad for the 2026 FIFA World Cup.

Personal life Kaku is the older brother of the football 7 and futsal player Facundo "Facu" Romero Gamarra, who has played in the Kings League.

Career statistics Club

International

Scores and results list Paraguay's goal tally first.

Individual Saudi Pro League top assist provider: 2022–23 Saudi Pro League Player of the Month: December 2022