The country's Treasury will face a fresh test of investor sentiment Thursday when it auctions bonds maturing in 2014, 2016 and 2022.
The interest rate for Spain's benchmark 10-year bond on the secondary market remained perilously high Wednesday at 6.6 percent. A rate close to 7 percent is deemed unsustainable for a country over the long term.
The financial market pressure has eased on Spain over the past week after remarks from European leaders that they work to help save the euro.
Barry Hatton in Lisbon, Portugal contributed.