Publicis saw demand for advertising rebound in October to achieve more than 7 percent organic growth in group sales, reversing a September slump with strength in the U.S., emerging markets and digital ads.
"While October numbers are extremely good, we should remain cautious: the fourth quarter is always uncertain particularly December," said Chief Executive Maurice Levy in an emailed statement.
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"At this point in time, we cannot yet confirm that growth and confidence are back."
September's contraction depressed Publicis' monthly revenue by 1.6 percent compared with a year earlier and led it to post weaker than expected third-quarter sales.
(Reporting by Leila Abboud and Gwenaelle Barzic)