Pressure is growing on Portugal from Germany, France and other euro zone countries to seek financial help from the EU and IMF to stop the bloc's debt crisis from spreading, a senior euro zone source said on Sunday. Some preliminary discussions on the possibility of Portugal asking for help if its financing costs on markets become too high have taken place since July, the source said. No formal talks on aid have started yet, a number of euro zone sources said, but the pressure was rising in the Eurogroup, which brings together euro zone finance ministers. "France and Germany have indicated in the context of the Eurogroup that Portugal should apply for help sooner rather than later," the senior source said, adding that Finland and the Netherlands had expressed similar views.