A 31-year-old man has previously been arrested for assault.
The man who died was a police officer in Sweden, but was not on duty when the assault occurred in connection with a World Cup event on June 30.
The two new suspects are 24 and 29 years old, respectively.
The younger one is suspected of stepping on the Swedish police officer while he was lying down. He is also suspected of hitting another Swede. The 29-year-old is suspected of kicking the other Swede.
According to police, there is no indication that the three men acted in concert.
The prosecution has announced that a prison sentence of between eight and ten months will be sought for the detained 31-year-old.
