Lamine Yamal's father, Mounir Nasraoui, was stabbed to death near Barcelona on Wednesday evening.
The 17-year-old Spanish striker had recently won the European Championship with Spain.
What happened?
The attack occurred in the town of Mataró, around 30 kilometers north-east of Barcelona.
Mounir Nasraoui suffered two stab wounds to the abdomen and one to the chest.
He was taken to a hospital in Badalona, a suburb of Barcelona, in a serious condition.
Why it matters for Lamine Yamal
Lamine Yamal had not yet visited his father in hospital due to the media hype.
He had taken part in his club's training session, but spoke to his father on the phone.
The two had a close relationship, with Mounir Nasraoui often attending Lamine's matches.
What comes next?
The police confirmed they had arrested a total of four suspects, accused of attempted manslaughter.
The motive for the altercation was not initially revealed, but it is believed to have started with an argument.
Lamine Yamal plays for FC Barcelona and had won the title with the Spanish national team at the European Championships.
He grew up in Rocafonda, a district of Mataró dominated by immigrants, mainly from Africa.
His father comes from Morocco, his mother from Equatorial Guinea.
For many children in Rocafonda, the 17-year-old Yamal is a great role model.
On Saturday, FC Barcelona will host Valencia for the start of the new LaLiga season.
The incident has shocked the football community, with many players and coaches offering their condolences to Lamine Yamal.
The investigation into the stabbing is ongoing, with the police working to determine the circumstances surrounding the attack.
Lamine Yamal's club, FC Barcelona, has offered its support to the player during this difficult time.
The Spanish football federation has also released a statement condemning the violence and offering its condolences to Lamine Yamal.