Emmanuel Moulin, Emmanuel Macron's nominee to head the Bank of France, told the Senate finance committee the ECB must be ready to tighten policy as inflation spreads, yet must weigh growth trade-offs. "It's essential that, without prejudice to its price-stability mandate, the ECB be able to take into account the impact of its decisions on growth," he said.

Moulin takes office days before the ECB's June meeting, where a rate hike is widely expected. Asked directly whether June rates will rise, he demurred: "A detailed analysis of data will be necessary to enlighten the position of the Governing Council." Investors will be reading his every word on an almost entirely unknown quantity.

Several political groups say Moulin lacks independence after serving as Macron's close adviser since 2017. He may still be blocked if three-fifths of votes across Senate and Assembly finance committees oppose him. "I've worked with different governments, always with the same compass: public interest," he told senators in his defense.

The ECB faces a genuine dilemma as cost increases spread through the euro zone. Francois Villeroy de Galhau, the outgoing Bank of France chief, has maintained a balanced approach during inflationary pressures. Moulin's appointment could tip the central bank toward a more hawkish stance—or complicate any move if political opposition delays his confirmation.