Jim Rogers told a British Newspaper that the pound could fall near parity with the dollar in coming years given Britain's increasing debt and lack of economic growth drivers.
Rogers said last week the pound was "finished" and people should avoid investing in Britain, leading to a retort from Prime Minister Gordon Brown that economic policy would not be influenced by speculators.
Sterling weakened against the dollar on Monday to near a 23-year low of $1.3500 reached on Friday. Asked whether he had a call on where the pound would be by year end Rogers said: "No...I'm a very bad short-term trader.
"I suspect it's going to make new lows -- it may take a decade,"
"There's two big holes developing in the UK's balance of payments -- North Sea oil drying up and the financial industry. I don't see anything replacing those two big holes."
Jim Rogers also commented on the new US President, "Obama has got the wrong plans and the wrong people" reiterating he was only positive on China and commodities.
"I'm not buying stocks anywhere -- the world is in recession and it's not going to get better, if politicians keep making mistakes it's going to last longer and longer."
Jim Rogers is a commodities and forex expert with many decades of sucessful trading behind him.