By Alan Charlish

WARSAW, Jan 26 (Reuters) -Central European currencies were mainly on the back foot on Thursday, as markets eyed data on economic growth in the United States and a review of Hungary's credit rating.

The forint EURHUF= has posted strong gains this week, boosted by a central bank pledge to keep its one-day deposit rate at 18% and raise the required reserve ratio for commercial banks from April.

The Hungarian currency, however, was 0.26% weaker against the euro at 388.55 by 1014 GMT on Thursday, as investors eyed a rating review from S&P scheduled for Friday, just a week after Fitch cut the outlook on Hungary's rating to negative from stable, citing policy weaknesses in a tough environment.

"We saw quite a big rally in the past couple of days so first of all this might be just some type of temporary correction," said Peter Virovacz, senior economist at ING in Hungary.

"Tomorrow Hungary is facing a ratings decision from S&P... after Fitch cut Hungary's outlook from stable back to negative I guess the market is quite anxious that maybe S&P could continue this trend."

Meanwhile, markets are looking ahead to a report on fourth-quarter U.S. gross domestic product that is expected to show a strong pace of growth, but with momentum slowing towards the end of the year.

"The U.S. data could have a significant impact on currency markets so investors are on the sidelines," Magyar Bankholding analysts said in a note.

The Czech crown EURCZK= was broadly stable at 23.787, hovering around 14-year highs after hitting its strongest level since October 2008 on Wednesday.

"The continuing combination of favourable weather and falling forward and spot gas prices is still primarily behind the strong Czech currency," CSOB said in a note. "These are helping mainly via better global sentiment - more stable returns and a weaker U.S. dollar," it added.

The Polish zloty was 0.12% weaker at 4.7225.

"We are moving towards the upper-band of a tight range," said Mateusz Sutowicz, a financial market analyst at Bank Millennium. "The weakening pressure is mounting, mainly due to local factors ... geopolitical tension regarding Ukraine but also that we still do not have any breaking information about the recovery fund."

Reporting by Alan Charlish in Warsaw, Jason Hovet in Prague, Krisztina Than in Budapest; Editing by Sherry Jacob-Phillips

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