In a parting shot before stepping down today as the European Central Bank's chief economist, and dominant force, Dr Issing said the stark differences in wage inflation across the eurozone were storing up future trouble.
"The continuing divergence in unit labour costs has caused some member states to lose a substantial degree of competitiveness. This can cause big tensions," he said
"Some of these countries have manoeuvred themselves into a difficult situation. They must do everything to change course," he told the German daily Handelsblatt.
While he did not name the culprits, Dr Issing was clearly fingering the Club Med quartet of Portugal, Greece, Italy, and Spain, all of which failed to kick their inflationary habits after joining EMU.