People living in North and South Lanarkshire will no longer be able to host or visit other households.
Nicola Sturgeon said rising cases in the Lanarkshire region are of 'particular concern' to the government.
Holidaymakers coming back Hungary and La Réunion will have to self-isolate from 4am on Saturday.
Nicola Sturgeon said there are 161 new cases of coronavirus in Scotland, 1.9% of newly-tested people.
From April to June, total deaths in Scotland were around a third higher than usual - around 4500 excess deaths.
There is some Covid-19 transmission in the city's hospitality sector, the First Minister said.
It is the first time there have been three deaths reported in a day since June 30, with 176 new cases.
Indoor household gatherings banned in two more council areas and extended in another three.
Scotland's 146 new cases amount to 2.4% of all newly-tested individuals.
UK transport secretary Grant Shapps made the claim but the Scottish Government defended its decision.
Total Covid-19 cases in Scotland over the course of the pandemic are now more than 21,000.
Holidaymakers to the southern European nation will have to isolate for 14 days when they return.
It means new Covid-19 cases in the country have been above 100 for five days in a row.
There are 156 new Covid-19 infections in Scotland with more than half in the Greater Glasgow and Clyde area.
The pandemic has 'underlined the need for improvement' in adult social care, Nicola Sturgeon said.
Just 15% of the Scottish Welfare Fund's budget was used between April and June, report finds.
The initiative which sees the UK Government foot 50% of diners' bills has not been extended into September.
SNP Westminster leader warns ending the furlough scheme in October is the 'height of irresponsibility'.
Indoor leisure resumes after more than five months closed amid the coronavirus pandemic.
The University and College Union (UCU) is calling on campuses to take measures to avoid a second Covid wave.