BRUSSELS — A day after giving France and Italy a provisional pass on their budget plans for next year, a top European Union official warned on Wednesday that those countries could still face disciplinary action for violating the bloc’s fiscal rules if the revised budgets did not pass muster.

The official, Jyrki Katainen, the European commissioner for economic and monetary affairs, said at a news conference in Brussels that despite his decision not to request that France and Italy redraft their 2015 budgets, their filings would face tough scrutiny. The two countries, which had initially submitted budgets that missed the union’s mandated targets by wide margins, announced further spending cuts this week.

“I want to underline that this does not mean that all draft budgetary plans will necessarily be found to be in full compliance with the Stability and Growth Pact,” Mr. Katainen said, referring to the European Union’s budget rule book. “We are not prejudging the outcome,” he said.

Mr. Katainen has been walking a tightrope in recent weeks. Cracking down too heavily on France and Italy could have forced more belt-tightening at a time of rising concern about the inability of the European economy to resume growth. Rejecting the budgets outright could have prompted battles with Paris and Rome that Brussels might not have been able to win.