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* Spain to demand banks set aside $45 bln-sources

* Disney (NYSE: DIS - news) profit beats expectations

* Yahoo (NasdaqGS: YHOO - news) director to step down

* Futures off: Dow (NYSE: DPD - news) 86 pts, S&P 12.8 pts, Nasdaq (Nasdaq: ^NDX - news) 23.75 pts

NEW YORK (Frankfurt: A0DKRK - news) , May 9 (Reuters) - U.S. stock index futures fell on Wednesday, mirroring European shares on concerns over the teetering state of Spanish banks.

* Spain will demand banks set aside another $45 billion against loans to builders as it battles to rebuild confidence, sources told Reuters. Huge bank losses have raised fears the country may need an international bailout.

* U.S.-listed shares of Banco Santander SA (Amsterdam: SANT.AS - news) dropped 5.5 percent to $6.02 in premarket trading.

* The situation in Europe (Chicago Options: ^REURUSD - news) has been a primary driver for Wall Street this week as the corporate earnings season winds down and there are few domestic economic indicators that could influence equities.

* The S&P 500 is down 2.4 percent so far this month while the Dow has fallen for five straight sessions.

* Possible fallout after elections in Greece has also dented sentiment. Leftist leader Alexis Tsipras was to meet the heads of Greece's mainstream parties Wednesday to try to form a coalition government. But the effort was not expected to succeed after he demanded they first agree to tear up the country's EU/IMF (Berlin: MXG1.BE - news) bailout deal.

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US STOCKS-Spanish bank fears push futures lower