The GSP (Generalised System of Preferences) Plus scheme gives Sri Lankan exporters get duty free access to EU markets.
Sri Lankan apparel exports to the EU have been growing because of the preferential access while those to the US, its biggest market, have faltered in the face of cheaper competition from China.
The GSP Plus scheme ends in 2008 and a decision to extend it by three years to 2011 is to be taken in January.
Exporters are concerned that they might lose market share if the lobby succeeds in blocking the extension of the scheme.
Peiris was asked at an exporters forum on Monday whether the lobby, which is backed by Tamil Tigers, could threaten Sri Lankan clothing exports, a mainstay of the economy.
"We'll counter this adequately. There's no need to worry undul