Thirteen people were injured when a car crashed into fans outside the derby match between Espanyol and Barcelona on Thursday.
The match, which could see Barcelona win the La Liga title, was delayed for several minutes in the early stages while the referee was briefed by police.
Police in Barcelona said four of those injured were taken to hospital but none were said to be in a serious condition.
Police added in a statement on social media that the incident did not present any danger to the crowd inside the stadium.
The driver has been arrested on suspicion of dangerous driving and causing injury.