Can I sponsor someone if their VISA has expired already?

A new VISA application should generally be submitted to the Home Office on or before the expiry date of the current VISA. If a new VISA application is not submitted before or on the expiry date the Home Office usually inform you that you have 60 days to find a new sponsor or leave the country.
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While you can submit a new VISA application during these 60 days, the application will require more information to explain why a new application was not made on or before the VISA expiry date.
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You are not allowed to work after your VISA has expired, and will not be allowed to work until the new VISA has been approved by the Home Office.
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We therefore recommend making sure that your new VISA application is ready to be submitted before your current VISA expires, and that any sponsorship offers are made 2-3 months before the current VISA expires.