Three Norwich City supporters have been banned from attending the club’s home and away fixtures following an incident during Saturday's win at Millwall.
The individuals were ejected from the away section of The Den and subsequently arrested by police after being found responsible for throwing a pyrotechnic onto the field that produced a thick yellow smoke, earning them stadium bans.
Following the incident, the Canaries received written confirmation from the Football Association of an investigation into their supporters' behaviour.
The outcome of the investigation could result in a substantial fine for the club and City have warned fans that such behaviour could even lead to "restrictions on supporters attending our future fixtures".
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A club statement said: "The club would like to remind its supporters of the zero-tolerance policy on the use of flares, smoke bombs, fireworks or any other form of pyrotechnic inside stadiums.
"It is illegal for supporters to bring any form of pyrotechnic into stadiums. These can cause severe burning, breathing problems, as well as damage to hands, hearing, lungs and eyes.
"As a major fire hazard, pyrotechnics can also cause damage to grounds and surroundings.
"Any supporter caught attempting to enter stadiums with pyrotechnics will be reported to the police, with a potential prosecution resulting in a criminal record, as well as a stadium ban, as per the club’s sanction tariff.
"All Norwich City fixtures should be safe for our players, staff and supporters."
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It is unclear how long the offending supporters will be banned.
FIFA boss Gianni Infantino was surprisingly spotted in the stands during the game in south London, which Norwich won 3-2 to move into the Championship play-off places.
The smoke bomb was thrown on to the pitch following Gabriel Sara's spectacular goal in the 65th minute, scored at the same end where 3,000 Canaries supporters were sat behind the goal.
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