* Sterling broadly firmer, safe-haven yen eases
* Britain's EU referendum on Thursday looms large
* Opinion polls show the 'Remain' camp regaining some momentum
By Ian Chua
SYDNEY, June 20 (Reuters) - Sterling rallied early on Monday as momentum swung in favour for Britain to remain in the European Union just days ahead of a referendum, helping underpin risk sentiment which in turn weighed on the safe-haven yen.
The pound climbed 0.9 percent to $1.4483 GBP=D4 , extending a recovery from last week's two-month trough of $1.4013. It jumped 1.7 percent to 151.75 yen GBPJPY=R , pulling well away from a three-year trough of 145.34 set on Thursday.
Investors took heart after three of six opinion polls published over the weekend showed a shift towards keeping Britain in the EU, but the June 23 vote still looked too close to call. poll findings will resonate today, likely seeing further advances for sterling, some renewed weakening in the yen and a firmer Australian dollar," said Ray Attrill, global co-head of FX strategy at National Australia Bank.
Indicating a general pick-up in risk appetite, U.S. stock futures ESc1 rose 0.9 percent, suggesting a positive open on Wall Street later in the day.
As a result, the yen dipped across the board - a move that may help ease worries about the strength in the currency.
On Friday, Finance Minister Taro Aso said he was deeply concerned about "one-sided, rapid and speculative" currency moves and would respond urgently if needed - a hint at possible yen-selling market intervention. dollar climbed 0.6 percent to 104.68 yen JPY= , while the euro put on 1.1 percent to 118.72 yen EURJPY=R .
Against the greenback, the common currency edged up 0.5 percent to $1.1333 EUR= . The dollar index .DXY eased 0.4 percent to 93.825.
The Australian dollar, usually sold off in times of heightened risk aversion, gained 0.4 percent to $0.7422 AUD=D4 . It rose 0.9 percent on the yen to 77.67 AUDJPY=R .
Analysts warned there is little conviction in markets and moves could easily reverse if sentiment turned negative.
"Price action seemed very tentative everywhere, reflecting a mild trimming of ultra-cautious positions ahead of this week's Brexit referendum," analysts at ANZ wrote in a note to clients.
There is little in the way of hard market-moving economic data out of Asia on Monday, leaving markets at the mercy of the ebb and flow of optimism over the UK vote. (Editing by Richard Pullin)