The removal of Britannia, the female personification of Britain, from the 50p coins has prompted a handful of MPs to ask the government to intervene.
Britannia has symbolised Britain on coins for centuries
Used on coins in Roman times, Britannia made a reappearance in 1672 - and MPs want to ensure her "uninterrupted presence" since then is not broken.
Britannia is shown sitting beside a lion, with a shield on her right side, holding a trident and an olive branch.
The Treaury said the next mint run would not include Britannia.
The Treasury also denied her presence had been "uninterrupted" as the MPs say, highlighting that she was temporarily replaced in 2007 when a coin was minted to mark the 150th anniversary of the Victoria Cross.
Royal Mint said it would not comment on redesign plans, but there has been speculation that Britannia will be replaced with an image representing modern Britain.
In a Parliamentary motion, Conservative MP Nigel Evans has asked the government to intervene in the "imminent removal" of Britannia.
His motion calls on the government to "understand the modern importance of historic symbols and to ensure that Britannia is not removed from British coins and that the uninterrupted presence of Britannia over 336 years is not broken".
The Treasury also said "the traditional Britannia design... will return in future mint runs".
The redesign comes after a competition launched in 2005 to encourage the wider public to submit designs.
A Treasury spokesman said: "As people will see when the new mint run is issued, the chosen designs represent the best traditions of British coinage, and are totally in line with the government's desire to celebrate our British heritage, including our historic national and heraldic emblems."