'We have not foreseen any European relaunch plan' for the economy, he told reporters at the close of an EU summit in Brussels.
Mr Juncker, who is also Luxembourg's premier and finance minister, said that such a plan could lead some nations to abandon 'the healthy rules of the stability pact', the EU's rule book for public finances.
He said that past experience had exposed 'insufficiencies' in these kinds of plans.
On Wednesday, Austrian Chancellor Alfred Gusenbauer said that EU efforts to contain the financial crisis needed to be followed up with an economic stimulus package to avert a recession.
'We now need a package for the real economy in order to avoid a risis of unemployment,' Mr Gusenbauer told journalists.
However, Dutch Finance Minister Wouter Bos quickly poured cold water on the idea, insisting that 'there is no need for a European package' to revive flagging economic activity.
Before the worst of the financial crisis erupted, European finance ministers ruled out the possibility of a sweeping joint stimulus plan to jolt the economy back to life. -- AFP