VILNIUS (AFP) - European Commission chief Jose Manuel Barroso played down jitters over the euro on Wednesday, after the currency tumbled to a four-year low point against the dollar. What I can guarantee is that the euro is a stable and strong currency. The current level is above what it was when it was created, Barroso told reporters during a visit to Lithuania. What is important is to show and to understand our commitment to keep the euro a strong and credible currency, he added. The European Union executives leader has been hammering home the message that he has no doubts about the future of the currency which has been in circulation since 2002. On Tuesday, the euro had tumbled as low as 1.2111 dollars, touching a level last seen on April 14, 2006. The euro used by 16 of the EUs 27 member nations has been shaken in recent months, first by the Greek debt crisis and then by concern of contagion to other peripheral eurozone countries. Lithuania is among the EU members seeking to adopt the currency, and is eying a 2014 switch from its its national currency, the litas. Lithuanian officials have repeatedly played down concerns over the euro, saying they still see it as a bulwark for the Baltic state against future economic slumps. Lithuanias plans have been dogged by problems in meeting criteria set down in the EUs 1992 Maastricht Treaty on economic and monetary union. Lithuania joined the EU in 2004, 14 years after declaring independence from the crumbling Soviet Union. It had aimed to adopt the euro in 2007 but failed narrowly to stay below a Maastricht-set inflation limit, and then its rapid economic boom went off the rails. Besides inflation, the other main entry criteria include the public deficit and debt. Exchange-rate stability is also a test, but the litas is already pegged to the euro. Lithuanias economic crisis helped ease inflation. Its public deficit the shortfall between state spending and revenue has now become the focus. Lithuanias centre-right government has imposed biting austerity measures to try to keep the euro drive on track and tackle the slump in the country of 3.3 million people. I welcome the fact Lithuania is making efforts, but I cannot anticipate the fact when Lithuania will be ready, Barroso said. Lithuanias fellow Baltic state Estonia is poised to adopt the euro in 2011. It would be the third EU ex-communist economy to do so, after Slovenia and Slovakia.