Money Saving Expert Martin Lewis has issued a two-day warning to Tesco shoppers.
He urged Tesco shoppers to get a move on if they want to save extra money using their Clubcards - but warned that they only have until Wednesday to do so.
Speaking on his namesake ITV show, Martin Lewis said: "Now, do you do your Christmas shopping at Tesco?
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"This is your last chance for a free boost.
"Basically the Clubcard Christmas Saver Scheme - you must top it up by next Wednesday."
He went on to explain: "What you do, you pay into it and it gives you vouchers to spend in store - but it adds 6 per cent on top.
"So if you know you're going to be spending in Tesco for Christmas you may as well charge that up before next Wednesday and put £200 in and you'll have £212 and it's a little bit of a boost.
"Merry Christmas."
Also on the show, Martin issued a warning to everyone with car insurance.
He told people to consider switching their car insurers now as he said price changes were due to come in.
He revealed insurers could make a big change to the prices of policies "in a few weeks".
