Home secretary Amber Rudd insists small businesses "will continue to attract" skilled foreign workers after the UK leaves the EU.
Ms Rudd reassured businesses there will be a transitional period when it comes to employing foreign workers in the UK after Brexit.
From March 2019, EU workers moving to the UK will have to register until a permanent post-Brexit immigration policy is implemented.
The home secretary has commissioned the migration advisory committee to consider the economic impact of EU workers in a bid to shape an evidence-based future migration policy.
Mike Cherry, chairman at the Federation of Small Businesses, said:
"Skills and labour from the EU play an important role in many small businesses, with 1 in 5 small employers having EU workers.
"The migration advisory committee needs to engage with the small business community to address the concerns of small employers and the self-employed."
However, the Confederation of Business Industry (CBI) said businesses "urgently" need to know what any transitional period would look like after Brexit.
Josh Hardie, deputy director-general at the CBI, added:
"Given the importance of mobile skills and labour for the UK economy, firms will want the review to move at pace and include the views of all sectors."
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