Prince Charles is on stand-by to fill in for the Queen at the State Opening of Parliament if she is too unwell to attend, it is reported.
Plans have been drawn up which would see him read his mum's Speech on her behalf.
It comes as the Prince of Wales takes on an increasing amount of duties from his 95-year-old mother, The Sun reports.
The ceremony takes place on Tuesday, May 10, with the speech setting out the Government’s agenda for the next session.
It will reference plans to grow the economy, cut the cost of living, make streets safer and clear the Covid backlogs.
A statement on the government's website says: "The Queen’s Speech will provide the leadership needed in challenging times to level up opportunities and employment in all parts of the United Kingdom."
The current session of Parliament will be prorogued ahead of the speech so security preparations can be made. The likely date of prorogation is yet to be confirmed.
Elizabeth II has only missed it twice in her 70 years on the throne, when she was pregnant with Andrew and Edward in 1959 and 1963.
The Queen will confirm her attendance on the day, with the plan being drawn up amid issues with her general health and mobility.
Last month, she caught Covid-19 but only experienced "mild symptoms" and continued some light duties at Windsor.
Before then, in her first public appearance since Andrew settled his sex abuse case, she alarmed Royal observers by telling Defence Services Secretary Major General Eldon Millar and his predecessor Rear Admiral James Macleod "as you can see, I can't move", while holding a walking stick and pointing to her leg or foot in a meeting at the castle.
Earlier this month it emerged she plans to spend more time at Craigowan Lodge, on her Balmoral Estate, which has had a £20,000 wheelchair-friendly lift fitted.
But this week, her unofficial biographer Robert Hardman said she was in “very good spirits” after reports she was now "largely confined" to using a wheelchair.
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He said: “Mobility is something of an issue now…I’m told by those very close to her that she's in very good spirits, you know - absolutely pin-sharp as ever.
“But there is a mobility issue inevitably when you're coming up to your 96th birthday and also dignity, I think it's terribly important."
And last year she spent a night in hospital for "precautionary checks" after cancelling a planned trip to Northern Ireland.
Since then, she has carried out a number of duties virtually or been replaced at events by 73-year-old Charles, who was also struck down with Covid a week or so before The Queen caught it.
The Queen's jubilee will be marked with a four-day bank holiday from Thursday, June 2.
