Panicked Brits have been told there is “no need” to stockpile after France banned lorry travel to Britain.
But the chief executive of the Food and Drink Federation, Ian Wright, told the BBC that there is “concern” over supply in the longer term.
It comes after France closed its borders to anyone travelling from the UK on Sunday night and the Port of Dover closed.
France is one of a handful of European countries to put Britain on the blacklist after a mutant strain of coronavirus was found ravaging through the south east of England.
The border closures have sparked fears that Brits could be hit with food shortages over Christmas.
The Port of Dover is a key passage for lorries carrying goods from the continent with 10,000 usually making the trip every 24 hours.
Mr Wright told the BBC: "The problem is the return journey of drivers coming to the UK. If they cannot be guaranteed either that they will get out of the UK because of the congestion or that they will be able to secure a return journey full of whatever product it is, that's going to make it much more unlikely for them to come in the first place.
"And, over time, because the transport system requires these round trips, that will reduce the ability of us to bring food into the country after Christmas if that takes effect.
"We need a pragmatic solution that gets drivers across the border and into the UK by whatever route in exactly the same way we had throughout the lockdown in March and in the earlier part of the year."
Roads out of England closed at Dover over fears mutant Covid will ravage Europe
Meanwhile, Rod McKenzie, Policy Director at the Road Haulage Association, told the Guardian there will be a “devastating effect” despite the ban only lasting an initial 48 hours.
He said: “It’s only 48 hours, but the French ban will have a devastating effect on the supply chain.
“We have seen in recent days the queues on both sides of the channel because of Brexit stockpiling and the Christmas rush and now border closures will mean everything including perishable food supplies will be impacted.
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“We depend on the short straits for our daily supplies. What we are talking about is everything: factory parts, fresh and frozen vegetables, and all the Christmas deliveries.”
The border closure has prompted police in Kent to activate Operation Stack on the coastbound carriageway of the M20 early on Monday – leaving freight lorries queueing for miles.
Transport secretary Grant Shapps said this morning: “Following the French Government's announcement it will not accept any passengers arriving from the UK for the next 48hrs, we're asking the public & particularly hauliers not to travel to Kent ports or other routes to France.
"We expect significant disruption in the area.
“My department is urgently working with Highways England and Kent Council on contingency measures to minimise traffic disruption in the area. We will share more details on these shortly.”
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