Morrisons has followed several other stores in implementing a sick pay cut for unvaccinated workers who isolate after being exposed to Covid.
The BBC reports other big retailers including Ikea, Next and Ocado have already imposed a similar ruling on their staff.
Unjabbed Morrisons workers who are told to isolate but test negative now get statutory sick pay of £96.35 a week.
Covid-positive staff get full sick pay regardless of vaccination status. The firm pays staff at least £10 per hour.
Chief executive Dave Potts first mentioned the policy in a conference call with investors in September.
The Guardian said the move was intended to encourage workers to get jabbed.
Under Morrisons' policy, if NHS Test and Trace informs an unvaccinated worker that they have been exposed to Covid-19, they will only get statutory sick pay, the legal minimum, when they isolate.
In England, unvaccinated people must isolate for 10 days if they are a close contact of someone with Covid, even if they do not test positive themselves.
However, any Morrisons employee who tests positive is paid full sick pay while they isolate, regardless of vaccination status.
Morrisons said its policy only applies to workers who are unvaccinated by choice, and each individual is treated on a case-by-case basis. Workers who cannot receive Covid vaccines for medical reasons are not obliged to isolate in England.
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