The company said it was difficult to forecast how much clients would spend in the fourth quarter due to the current uncertainty in financial markets and the more negative outlook for the global economy: "This is our most significant trading period, with seasonally higher advertising volumes, project close-outs and determination of performance-related incentives."
Its share price has recovered to 59.25p, down only 7%, after being knocked as low as 55.25p in early trading.
In a trading update the company revealed its overall revenues for the nine months to September had grown by 20.8% with organic growth of 7.3%.
Aegis Media revenues were up 26.1% and market research division Synovate's revenues were up 12.8%.
However, there were a number of signs that indicate the strength of its past performance is petering out.
The company said demand had slowed in the UK, US and Spain as it had anticipated last quarter.
UK media organic revenue suffered a small drop in September, US organic revenue was down in the third quarter in both media and market research, and Spanish media organic revenue was slightly negative for the year so far.
Aegis also pointed to bright spots such as double digit organic growth in media in September in France, Germany, Italy, Central and Eastern Europe and the Nordics.
It also said its financial position remains strong, with no major refinancings needed before 2011 and the ability to draw a further £112.1m from its current debt facility.
Finally it pointed to the strength of the Euro and the dollar relative to sterling as being beneficial to its reported results.
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