Chancellor Angela Merkel praised Madrid's austerity drive during a visit to Spain and gave her powerful backing to the country's economy minister in his bid to lead the Eurogroup forum of finance ministers.
Merkel hailed Luis de Guindos' handling of the Spanish crisis, saying he was "an excellent economy minister in Spain in difficult times" during a joint press conference with Spanish Prime Minister Mariano Rajoy.
The German leader's support could be crucial in landing him the job, which would give the austerity policies favoured by Berlin a powerful defender in the European Commission.
Both Merkel and Rajoy, who have been allies in stabilizing the finances of heavily indebted Spain, defended the need for further austerity and economic reforms, saying this boosted economic growth.
"The public deficit and debt levels must be reasonable," Rajoy told the news conference in his northwestern home city of Santiago de Compostela.
"Structural reforms are sometimes hard, they are sometimes difficult and complicated to explain, but they boost economic competitiveness and levels of wellbeing and wealth and jobs."
Rajoy's government claims to have overseen something of a recovery in Spain's economy, which emerged last year from a double-dip recession sparked by a 2008 property crash.
"I share Mariano Rajoy's opinion regarding the combination of budget austerity and reforms," Merkel told the news conference.
The leaders' defence of austerity came as France lurched towards political turmoil after the country's firebrand Economy Minister, Arnaud Montebourg, criticized Germany's austerity drive and warned Paris would no longer "be pushed around" by the EU's economic powerhouse.
This led French President Francois Hollande to instruct his Prime Minister Manuel Valls on Monday to form a new government.
France's economy is stalling and its central bank warned this month that Hollande had no hope of reaching his target of 1.0 percent growth for 2014.
The French economy has been stagnant for the past six months and the government was forced to halve its growth forecast to 0.5 percent for this year.
'Tightening is much weaker'
Germany earlier this month snubbed a request from Hollande for an EU-wide shift of economic policy in order to encourage growth.
Since the start of the eurozone debt crisis in 2010, Germany has faced accusations that by failing to use its standing as Europe's biggest economy to do more to kickstart growth, it is leaving struggling partners in the lurch.
But European markets and bonds shrugged off the upheaval in France, boosted by comments last week from ECB chief Mario Draghi who suggested recent monetary policy measures would get the eurozone back on its feet.
Hollande and Italian Prime Minister Matteo Renzi have been especially vocal in calling for an easing of the fiscal austerity imposed by Germany.
IMF chief Christine Lagarde, a former French finance minister, waded into the debate on Monday, saying in an interview that Germany should play a bigger role in propelling economic recovery in Europe.
"What I think is very important for Germany is to participate in the recovery movement in a very intense way. It has the means to do so," she told Swiss public broadcaster RTS.
"We have seen a process of very strong budget tightening over the past three years," she said, adding that "fortunately, in 2014 and 2015, this budget tightening is much weaker".