Visa Inc. may be preparing to debut its ties to Google Inc.’s Google Wallet mobile-payments scheme in London at the 2012 Summer Olympic Games, sources suggest.

When Google Wallet launched in the U.S. in September with MasterCard Worldwide as its first partner, Google said it had reached agreements with all the major card brands to join the effort. But it provided no timeframe for Visa, American Express Co. and Discover Financial Services to come aboard (see story).

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