BRUSSELS - Italy said on Tuesday it may want to tap euro zone aid to ease its borrowing costs as finance ministers struggled to convince markets they are getting a grip on the bloc's debt crisis, which a top European Central Banker said could escalate. Prime Minister Mario Monti, who is under intense market pressure to shape up his economy and avoid being drawn into the centre of the debt crisis, said Italy could be interested in tapping the euro zone's rescue fund for bond support. "It would be hazardous to say that Italy would never use (this mechanism)," he said after a meeting of European finance ministers in Brussels. "Italy may be interested." He is worried by a rise in Italian bond yields, which were slightly below 6 percent on Tuesday having bounced above the day before. A sustained period above that threshold could open the way to 7 percent, beyond which servicing costs are widely deemed unsustainable. Monti's comments show the 2-1/2 year-old euro zone crisis risks engulfing Italy, the bloc's third-largest economy and a member of the Group of Seven economic powers that is widely viewed as too big to bail out. Overnight, finance ministers outlined an aid package for Spain - the euro zone's fourth-largest economy - but they struggled to convince markets it would help stabilise the bloc. The ministers agreed to grant Madrid an extra year until 2014 to reach its deficit reduction targets in exchange for further budget savings. They also set the parameters of an aid package for Spain's ailing banks. The decisions were aimed at preventing Spain, mired in a worsening recession, from needing a full state bailout which would stretch the limits of Europe's rescue fund and plunge it deeper into a debt crisis. Markets were disappointed the meeting did not offer more. The euro initially traded near a two-year trough against the dollar and hit a five-week low versus the yen, with sentiment edgy as the focus shifted to a German court hearing. Germany's top court also addressed whether Europe's new bailout fund and budget rules are compatible with national law in a process influencing not just how to tackle the euro zone crisis, but how much deeper European integration can go. The hearing into complaints about the fund, the European Stability Mechanism (ESM), and fiscal pact may indicate how long the court will keep Europe on tenterhooks.