Rangers and Celtic face more work to convince the Scottish Government that their Premiership meeting should go ahead on Sunday.
First Minister Nicola Sturgeon welcomed statements from both clubs urging supporters to stay at home during Sunday's Celtic Park derby.
But no final decision has been taken on the fate of the game with a judgement promised "over the course of the next few days".
Rangers came under major criticism from the government over their response to thousands of fans gathering to celebrate their title win on March 7, and ahead of their game against St Mirren 24 hours earlier.
Ibrox boss Steven Gerrard and skipper James Tavernier, and Celtic counterpart John Kennedy issued messages over the weekend pleading with supporters to abide by lockdown restrictions.
"I hope the clubs will continue that over the next few days," Sturgeon said during a coronavirus media briefing.
"It's not just one statement and the work is done. As we know from experience of the last year, these communications are really important on an ongoing basis.
James Tavernier, Rangers captain. Message is clear and unequivocal. Stay home. Stay safe. Support Rangers 👍🏼🇬🇧 pic.twitter.com/XMErDRqtV8 — Rangers Football Club (@RangersFC) March 13, 2021
"I spoke to the chief constable personally last week about his views on what might transpire if the Old Firm match goes ahead. The justice secretary (Humza Yousaf) has been in contact with police and we will be in further contact with police over the course of this week.
"They will have intelligence of their own on whether it appears to them that fans in the main are following the advice or whether there is a significant risk of fans coming out to gather. On the basis of all of that we will have to take a judgement.
"I don't want to be in a position, I never want to be in a position, of standing here and saying football matches can't go ahead, or any of the other things that we really enjoy in life can't go ahead.
"But that's the reality while we are still in this position. Big gatherings present a risk of transmission and we are trying to get transmission as low as possible so that we can open up all of the things we enjoy doing.
Ahead of this weekend's match the message from the Club remains the same, please continue to follow Gov guidance, stay home and stay safe. Please do not attend Celtic Park on Sunday, your cooperation is very much appreciated🍀 pic.twitter.com/lMuRez8Uav — Celtic FC SLO (@CelticFCSLO) March 15, 2021
"That's why we have to be careful and considered about this. I think a lot of people felt aggrieved at what happened a week past Saturday and Sunday, and understandably so because everybody is still living under these difficult restrictions."
Covid-19 cases have risen in the west of Scotland over the past week but chief medical officer Gregor Smith stated it was too early to understand the full impact of the title celebrations.
"What we are seeing over the last seven days, however, is an increase in the number of cases associated with many of those areas, particularly across Lanarkshire, Glasgow, and Glasgow City in particular, and parts of Ayrshire & Arran as well," he said.
"How closely we can associate that with events of last weekend is at this stage difficult.
"But, during the interviews contacting tracing teams are having with those who have tested positive, there are a small number who are revealing that they either took part in those celebrations or were involved in house parties that arose from those as well.
"So we can't say it's not having an effect because we are seeing a rise in cases.
"It's still too early to tell, we have got to remember the incubation period for this virus is anything up to a 10-day period so what happens over coming days is going to be fairly revealing in that sense."
