* Dollar gains as stocks rally
* Worries about euro zone debt continue to haunt euro
* Friday's U.S. jobs, Bernanke remain key
* Estonia now part of euro zone
(Recasts, adds quotes, U.S. data, updates prices)
By Julie Haviv
NEW YORK, Jan 3 (Reuters) - The dollar gained slightly against the euro on Monday as global stocks rallied, and was expected to outperform the single European currency given concerns about some euro zone nations' ability to sell debt.
Thinned trading due to holidays in Tokyo and London added to volatility in the euro, which now trades as a 17-country unit after Estonia gained full membership on Jan 1.
"You really cannot read too much into today's market action," said Mark McCormick, currency strategist at Brown Brothers Harriman in New York. "Having said that, there are plenty of factors that should weigh on the euro over the near-term while the dollar should continue to benefit from strong economic data."
Manufacturing in the United States and Europe accelerated in December, while growth in China and India slowed to a more sustainable level, helping to fuel a move by investors into riskier assets. [
]Wall Street stocks launched the new trading year with gains of 1 percent or more, extending the late-2010 rally on optimistic signs about a global economic recovery. [
]. Rising U.S. Treasury bond yields also benefited the U.S. dollar. [ ]Weighing on the euro, meanwhile, were worries about the ability of certain euro zone countries to sell an abundance of debt. Portugal is expected to refinance 11 billion euros worth of debt and Spain 32 billion euros worth of debt in the first quarter, according to BBH's McCormick.
In late afternoon New York trading, the euro fell to $1.3358 <EUR=>, down 0.14 percent on the day.
The euro, however, fared well against other currencies, rising 0.65 percent against sterling to 86.27 pence <EURGBP=> and gaining 0.4 percent versus the yen to 109.06 yen <EURJPY=>.
Greg Anderson, senior currency strategist at CitiFX in New York, said markets are "expecting further U.S. economic outperformance in the first quarter" which is dollar-positive.
He also expects further losses in the euro starting this week "until the market is satisfied with the outcomes for Portugal and Spain."
Anderson added that the currency market will more or less have the same theme as last year, "with the euro being sold off because of the euro zone debt crisis."
The euro ended 2010 around 6.5 percent lower against the dollar, its biggest annual drop since 2005, weighed down by a debt crisis that hit Greece and Ireland.
Investors are further worried about Spain and Italy, which later in the spring will be hunting for buyers of 400-billion euros in debt as maturing bonds fall due.
The single euro zone currency, however, climbed last week, hitting roughly three-week highs versus the dollar, as bears gave up their positions, frustrated by the currency's firm support at its 200-day moving average just below $1.31.
Some traders said the euro gained some ground as European equities rose <
> after earlier euro selling by macro funds. "Without an upside surprise in the (U.S.) job data this week, dollar/yen is likely to come under renewed pressure," analysts at BNP Paribas said in a note.U.S. nonfarm payrolls due out on Friday are seen rising 140,000 in December, a Reuters poll showed. U.S. Federal Reserve Chairman Ben Bernanke's congressional testimony scheduled for Friday will also be closely watched.
The dollar rose 0.6 percent against the yen to 81.64 yen <JPY=>.
The dollar was down 0.06 percent against the Swiss franc to 0.9329 francs <CHF=>, after dropping to an all-time low of 0.9301 on Friday. The euro was flat against the Swiss franc at 1.2466 francs <EURCHF=>, still some distance away from its record low at 1.2398 francs hit last week.
(Additional reporting by Gertrude Chavez-Dreyfuss, Editing by Chizu Nomiyama)