* Euro, sterling extend gains vs yen
* Investor risk appetite improves as Tokyo shares rally
* Japan govt says to provide public funds to firms
By Masayuki Kitano
TOKYO, Jan 27 (Reuters) - The yen fell against the euro and sterling on Tuesday as Tokyo shares rose and after the Japanese government confirmed a capital injection scheme to help companies seriously hurt by the financial crisis.
The yen had fallen the previous day after British bank Barclays <BARC.L> said it would report a 2008 pretax profit and U.S. data showed a rise in home sales, helping revive investors' risk appetite.
The yen extended its losses on Tuesday after the Japanese government launched a $16.7 billion scheme to buy shares in companies whose future has been threatened by the financial crisis [
]That partially thawed investor risk aversion by boosting the Nikkei share average <
>, which jumped 4.9 percent. [ ]The yen often takes its cue from perceived swings in investors' risk appetite and has tended to fall against higher-yielding currencies when risk tolerance increases.
"The currency market had just seen a slight reduction in financial sector concerns the previous day, and that coupled with positive news for equities forced the yen to retreat," said Takahide Nagasaki, chief FX strategist at Daiwa Securities SMBC.
But market players said the latest fall in the yen may have been exacerbated by position unwinding, and played down the impact of the government's rescue scheme, since details of the plan had already been revealed at the weekend.
"It's hard to say whether market players will start taking risks and sell the yen because of this," said Tohru Sasaki, chief foreign exchange strategist for JPMorgan Chase Bank in Tokyo.
"The yen had already been sold ahead of time and stocks had risen, so it's hard to tell just how much of this move stemmed from the news and how much of it was stop-loss position unwinding," Sasaki said.
Market watchers said speculators took the jump in equities as an opportunity to cover short positions ahead of the Federal Reserve's two-day policy meeting starting Tuesday, giving the euro and sterling a lift against the yen.
The euro was up 0.8 percent at 118.40 yen <EURJPY=R> on trading platform EBS, having climbed to 118.91 yen earlier. The euro hit a seven-year low of 112.08 yen last week.
Sterling climbed 1.2 percent to 125.85 yen<GBPJPY=R>, having rebounded from last week's record low of 118.80 yen.
Amid the yen's broad weakness on Tuesday, the dollar rose 0.4 percent to 89.42 yen <JPY=>.
EURO, STERLING OUTLOOK MURKY
Sterling also rose against the dollar, climbing 0.6 percent to $1.4085 <GBP=D4> and pulling away from a 23-year low of $1.3500 hit late last week after data showed Britain's economy shrinking at its fastest pace since 1980.
The yen could fall further against sterling and the euro in the near term, especially if global stock markets rise and point to further improvement in investors' risk appetite, traders said.
But the euro and sterling were unlikely to see a sustained rally at this point, despite the previous day's rally, they said.
"What took place was probably a temporary unwinding of positions that were tilted towards selling European currencies," said Yuji Matsuura, joint general manager for Aozora Bank's forex & derivatives trading group.
Germany's Ifo monthly business climate index due later on Tuesday could determine if the euro can retain its momentum, traders said.
Against the dollar, the euro rose 0.3 percent to $1.3230 <EUR=>.
A Reuters poll of economists showed German corporate sentiment likely deteriorated in January to the lowest levels since German reunification in 1990, due to weakening demand and production cuts. [
] (Additional reporting by Shinichi Saoshiro; Editing by Michael Watson)