Philippe Clement has sent another clear message to Rangers supporters after the club was hit with a fine over pyro.
Rangers, Celtic and Motherwell were all served fines related to the use of pyrotechnics during the last round of the Scottish League Cup.
The match between Rangers and Motherwell was delayed for five minutes due to the use of pyrotechnics devices at Hampden.
Now, Clement has repeated his calls for fans to ditch pyro devices after the club was served the fine. He previously issued a plea to supporters urging them against pyro usage.
"I gave that message already several times so everybody knows my opinion about that," he said.
"First it's not safe, secondly, it costs the club money and we want to use that money in a better way that we can do the right things with the squad so the squad becomes better and the fans can be more happy with the squad.
"So again a clear message that it doesn't help in any sense towards the team in that way and I understand that people want to make a good atmosphere and maybe using those things but the best thing they can use is their voice and to sing and to support the players because in that way I've been really happy in Scottish football with the atmosphere in the stadiums and that's much more important than pyro."
On whether the issue could fully be tackled, he added: "I don't know how the organisation is, how the body scans are or whatever so I can only say what I said last couple of times and this time again.
"I think it's really clear for everybody what's good intentions for the club."
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An SPFL statement read: "[The] irresponsible behaviour by a minority of fans led to a 14 minute delay to Celtic v Aberdeen, a 5 minute delay to Motherwell v Rangers and caused significant inconvenience to thousands of fans at the game and to supporters watching worldwide.
"The SPFL, Scottish FA, Police Scotland and other organisations have been clear that such use of pyrotechnics is illegal and poses clear dangers and health and safety risks to fellow supporters, players and those working at matches.
"There have been a number of complaints from supporters about these incidents and the SPFL and Scottish FA have been in ongoing discussions with the clubs involved in the weeks since the semi-finals.
"The SPFL can now confirm that Celtic, Motherwell and Rangers have all been issued with formal notices of complaint under SPFL Rule H34 and each club will face a disciplinary hearing."
The statement added: "Preparations are ongoing ahead of the Premier Sports Cup Final between Celtic and Rangers at Hampden Park next week, as the SPFL prepares to welcome a capacity crowd for one of the highlights of the Scottish sporting calendar.
"The SPFL and Scottish FA will continue to work closely with the finalists in the build up to this showpiece occasion to reinforce the importance of ensuring a safe and enjoyable match day experience for all supporters, in the context of what is now an ongoing disciplinary process."
