Scottish football clubs will incur 'considerable additional costs' implementing the covid passport scheme from next month, Neil Doncaster has said.
The chief executive of the SPFL also revealed that discussions are ongoing with the Scottish Government about providing support to clubs to cover the costs.
From October 1, clubs that have more than 10,000 fans in their stadium will be required to ask supporters to show double vaccine certification.
Doncaster said the SPFL is concerned about the practicalities of delivering the scheme and said spot-checking is the only way it can be done.
Asking every fan to show a vaccine passport will see "considerable" costs for clubs, Doncaster said.
Speaking to MSPs on the covid recovery committee, Doncaster said: "In terms of stewarding, as has already been pointed out, there is a real shortage of security staff and stewards in the market.
"Creating an outer cordon, which is the only realistic way we believe of implementing such a spot checking scheme, clearly will require a great many more stewards.
"I've had discussions with a number of the clubs who have been involved, and they believe that the costs, purely in terms of stewarding and infrastructure, will be upwards of £5000 per game.
"That's before any technology costs and at the moment it's actually very difficult to put a finger on that, so there are significant costs per game.
"Wherever you've got a crowd that is likely to be over 10,000, any such game and that will involve Scottish FA and SPFL games as well, those games will require a large amount of additional stewards.
"Certainly at the moment it's not clear how easy it will be to find the stewards, the only certainty is that there will be considerable additional costs.
"We are in dialogue with Scottish Government officials as to what extent there may be support for those additional costs."
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