Martin Lewis has given a one-day warning to shoppers at Tesco.
The money-saving expert has encouraged shoppers to hurry if they want to save extra money using their Clubcards.
He warned that shoppers only have until tomorrow (Wednesday) to do so, reports Manchester Evening News.
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Speaking on his namesake ITV show, Martin Lewis said: "Now, do you do your Christmas shopping at Tesco?
"This is your last chance for a free boost.
"Basically the Clubcard Christmas Saver Scheme - you must top it up by 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".
