Police arrested four people at Sheffield United’s friendly match against Turkish club Fenerbahce on Thursday night.
One man was arrested for being drunk and disorderly, one was arrested following an altercation in the south stand car park.
A police spokesman said two people were arrested on suspicion of possessing flares within the stadium.
The flares were let off in the away end during the first half of the match after Fenerbahce scored.
The match at Bramall Lane, ended in a 2-1 win for Sheffield United.