Athletics' world governing body, IAAF, is seeking assurances that the new immigration policy in the United States will not affect the 2021 World Championships.
President Donald Trump has issued an executive order banning individuals born in seven mainly Muslim countries - Iraq, Iran, Libya, Somalia, Sudan, Syria and Yemen - and all refugees from entering the US.
The US is scheduled to host the World Championships for the first time in 2021 - in Eugene, Oregon - and the IAAF has asked for more information on the immigration order.
It said in a statement: "We clearly need to understand the implications of this new US immigration policy and will be seeking assurances that it will not adversely affect the IAAF World Championships in the USA in 2021."
On Sunday, Sir Mo Farah, who won the 5,000 metres and 10,000m double at the World Championships in 2011 and 2015, expressed his relief after the Foreign Office said Trump's order did not apply to UK nationals.
Farah, currently training in Ethiopia, is a British citizen but his ability to return to his family in the States was initially unclear because his country of birth, Somalia, was included on the banned list.