LONDON — At the start of another critical week for the euro, the head of the finance ministers that use the currency, Jean-Claude Juncker, reinforced expectations Monday of an initiative to lower Spain’s borrowing costs, which had hit alarming heights.

The comments came as the U.S. Treasury secretary, Timothy F. Geithner, prepared for meetings in Germany with the German finance minister, Wolfgang Schäuble and the president of the European Central Bank, Mario Draghi, a visible reminder that the euro zone crisis, which began in early 2010, is having global repercussions.  Read more