Tony Blair, the former UK prime minister, is re-emerging as a possible choice to be the European Union’s first full-time president after four momentous crises reinforced the argument for having a high-profile international personality in the job.

According to EU officials and diplomats, the impressive performance of Nicolas Sarkozy, France’s president, during his six-month spell in charge of the EU last year has strengthened the hand of those who say a big name should guide the 27-nation bloc.