Alen Halilović (born 18 June 1996) is a Croatian professional footballer who plays as an attacking midfielder for Dutch club Fortuna Sittard.
As the Prva HNL's youngest ever goalscorer (until May 2021) and the youngest ever debutant for the Croatia national team, he was considered to be one of the most promising young talents of European football.
2010
This made him the youngest goalscorer in the history of the league, at the age of 16 years and 112 days – breaking the record set in November 2010 by his teammate, Mateo Kovačić.
The record would last until 22 May 2021, when Lovro Zvonarek broke it by scoring his first goal aged 16 years and 14 days.
2012
On 27 September 2012, he made his debut for the first team in the "Eternal derby" win over Hajduk Split (3–1), when he replaced Sammir for the final ten minutes of the match.
This made him the youngest debutant in the history of Dinamo Zagreb, at the age of 16 years and 101 days.
In the next round match against Slaven Belupo, he again came off the bench and scored the final goal in a 4–1 victory.
In November 2012, Halilović scored his second league goal for Dinamo in a 5–0 win against NK Zadar, from outside of the box on an assist provided by Kovačić.
In his first professional season with Dinamo, he also managed to participate in UEFA Champions League.
On 24 October 2012, he made his European debut in the 90th minute of the encounter against the French team Paris Saint-Germain at Maksimir Stadium, coming on as a substitute for Kovačić.
Thus he became the club's youngest player ever to feature in a Champions League match, and second youngest player in the history of the UEFA Champions League.
2014
In March 2014, Barcelona reached an agreement with Dinamo Zagreb for a five-year transfer to the club.
He made one appearance for the senior team (in the Copa del Rey), spending most of the season with the B-team.
On 27 March 2014, FC Barcelona reached an agreement with Dinamo Zagreb for Halilović to join Barcelona in July 2014 at the start of the summer transfer window.
He signed a five-year contract for an initial amount of €2.2 million, set to increase if he secures a spot on the first team, and was assigned to the reserves in Segunda División.
On 2 April 2014, FIFA announced that Barcelona would be banned from buying players until summer 2015 after illegally signing underaged players, putting the move in doubt.
On 23 April 2014, FC Barcelona's transfer ban was suspended pending an appeal, allowing the transfer to go ahead for the time being.
On 2 May 2014, Halilović signed for Barcelona on a five-year contract for €2.2 million.
2015
Halilović made his first appearance for Barcelona's senior team on 15 January 2015, replacing Adama Traoré for the last 28 minutes of a 4–0 away win against Elche CF in the last 16 of the Copa del Rey.
On 21 August 2015, he was loaned to fellow league team Sporting de Gijón, in a season-long deal.
On 29 August, Halilović made his La Liga debut, coming on as a second-half substitute for Carlos Carmona in a 0–0 away draw against Real Sociedad.
His first goal in the category came on 3 October, opening a 2–1 win away to RCD Espanyol, and on 1 November he netted the only goal of a win against Málaga CF at El Molinón.
Halilović was a half-time substitute for Nacho Cases on 15 December in the national cup last-32 second leg and scored twice – one a penalty kick – to ensure a 3–3 home draw against Real Betis, who advanced 5–3 on aggregate.
2016
He then had a season-long loan to Sporting Gijón, before signing for Hamburg in July 2016.
He spent much of the next two seasons on loan to Las Palmas before joining AC Milan.
He went on loan spells with Standard Liège and Heerenveen.
On 19 July 2016, it was announced that Halilović would join Bundesliga side Hamburger SV for €5.5 million, with a buy-back clause for Barcelona worth €10 million.
Two days later the move was confirmed, with Halilović signing a four-year deal.
Halilović scored his first goal for the club on his debut in a DFB-Pokal cup match against FSV Zwickau on 22 August 2016.
This was the only goal of the match and helped Hamburg to the next round.
He had to wait until 10 September to make his league debut, however, which was in the second league game of the season against Bayer Leverkusen.
2017
In January 2017, Halilović joined Las Palmas for 18 months in a loan deal, with an option for Las Palmas to buy him.
In the first game of the 2017–18 season for Las Palmas, playing against Valencia, Halilović received a straight red card for a tackle on José Gayà, in the 33rd minute.
2018
On 3 July 2018, Alen Halilović joined Serie A club AC Milan on a free transfer.
He signed a contract until 30 June 2021.
2019
On 31 January 2019, Halilović joined Standard Liège on loan with an option to buy until 30 June 2020.
Starting September 2019, Halilović's loan to Standard Liége got cancelled and he went on loan to the Dutch team SC Heerenveen for the duration of a year.
2020
Having left Milan after contract termination in October 2020, he signed with Birmingham City in 2020, then Reading in 2021 and Rijeka in 2022 all on brief spells.
Following the abandonment of the Eredivisie on 24 April 2020 due to the COVID-19 pandemic, Halilović returned to Milan.
On 5 October, Milan announced they terminated his contract by mutual consent.