Mark Drakeford has revealed a decision on how sporting events in Wales will continue amid a rise in coronavirus cases will be made on Monday.
Cardiff City and Swansea City have both seen their weekend Championship fixtures against Derby County and Queens Park Rangers respectively called off due to Covid-19 outbreaks.
On Friday, it was announced that the Ospreys had forfeited their Champions Cup match with Racing 92 after a spread of the virus within their camp.
A European Professional Club Rugby statement read: "EPCR has been informed by Ospreys that they have a recorded a number of positive tests for Covid-19 among their playing squad and as a consequence, the club is not in a position to safely fulfil its fixture."
Further postponements in the sport are expected this month, while rugby's European competition were on the verge of chaos after the French government restricted travel between the UK and France.
Premier League shareholders are set to convene on Monday in a bid to discuss the possibility of temporarily halting the top-flight schedule.
Prior to the final weekend of sporting events before Christmas, Welsh Government chiefs held discussions over how best to safeguard those participating and attending fixtures throughout the country over the coming weeks and months.
And First Minister Drakeford has revealed they are seeking further information on how the Omicron variant operates in outdoor areas before making a decision - which could potentially include a reduction on crowd limits - on Monday.
"Big events, sporting events, the festive period, a big time for the sporting calendar. There are no plans for that to change at the moment and we'll be making some announcements about that on Monday," he told BBC Breakfast.
"The cabinet decided yesterday we needed some extra information about the way that the Omicron variant operates in the outdoors, particularly in places where there are already safeguards like the coronavirus pass in Wales in place.
"That information we will develop during the day we'll talk to the organisers of those big rugby derbies, the Welsh Grand National, football matches that are planned, and then we'll come to some decisions on Monday as to how they can best go ahead."
Cardiff are due to host Coventry City in the Welsh capital on Boxing Day while Swansea are next scheduled to be in home action against Luton Town on December 29.
In the United Rugby Championship, Cardiff are set to take on the Scarlets at the Arms Park on Boxing Day, with the Ospreys facing the Dragons at the Swansea.com Stadium on the same day.
There are also further Welsh derbies, hosted by the Dragons and Scarlets, scheduled to take place on New Year's Day.
The festive derby matches are the biggest events in the regions' calendars and regularly attract the largest crowds. The financial implication of a restriction on crowd numbers would be significant.
At present, fans attending sporting fixtures in Wales are required to display proof of vaccination, although there are no restrictions on crowd numbers.
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