Nicola Sturgeon has said North and South Lanarkshire are being considered for the highest level of restrictions under the proposed new lockdown tier system.
The First Minister has outlined provisional levels for council areas across Scotland ahead of a parliamentary vote on the new framework.
She told Holyrood that areas in the central belt covered by tougher measures would likely move into Level 3, while the rest of the country would be at Level 2.
She added that it was hoped local authority areas including the Highlands, Shetland, Orkney, the Western Isles and Moray would go into Level 1, while Dundee could also go into Level 3.
The Scottish Government will launch a postcode checker so people know exactly which tier of restrictions they live in.
The five-tier system was announced last week and is going through a debate at the Scottish Parliament.
If the framework is voted through, it will begin from Monday November 2.
Final decisions on which tier each local authority will be assigned will be made later this week.
The First Minister also said that areas in level one will still face a ban on indoor gatherings between households as a temporary extra precaution.
Ms Sturgeon has also announced changes to hospitality restrictions in the proposed tier system.
She told Holyrood that ministers plan to establish an expert group to examine reintroducing low-level music to venues.
She also said closing times for venues at Level 1 and Level 2 would be extended to 10.30pm from 10pm, before adding that pubs and restaurants could remain open under curfew at Level 3 but not serve alcohol.
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