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The U.S. government might expand coronavirus testing requirements for international air travelers beyond Britain as early as next week, sources briefed on the matter told Reuters on Wednesday.

The Centers for Disease Control and Prevention (CDC) and other U.S. agencies held a lengthy call with U.S. airlines Wednesday that discussed expanding COVID-19 test requirements to travelers arriving from other countries, sources briefed on the call said.

The U.S. government Monday began requiring all airline passengers arriving from Britain - including U.S. citizens - to test negative for COVID-19 within 72 hours of departure.

The CDC said in a statement, "efforts are currently ongoing in the U.S. to assess the risk reduction associated with testing and other recommended preventative measures, determine what a feasible testing regime for air travel may look like, and gain some level of agreement on standards for a harmonized approach to testing for international air travel."

The CDC expansion could eventually cover all U.S.-bound international air arrivals, officials said. Canada said Wednesday it will soon require that air travelers test negative for COVID-19 before arrival.

Airlines for America, a trade group representing major U.S. airlines, said Wednesday it has "been advocating for the federal government to set a national standard on testing in order to lift travel restrictions." The group added it believes "testing can be used to safely reopen borders."

A U.S. Transportation Department spokesman confirmed the call with airlines took place.

Airlines told government agencies Wednesday any new testing requirements should be phased in by country and it must be determined if there is enough testing capacity and a willingness to allocate those tests to facilitate international travel before expanding requirements, the sources said.

Officials said the White House could make a decision as early as next week on adding new countries to the testing requirements but it is not clear when those new requirements would take effect.

U.S. Assistant Secretary for Health Brett Giroir said Tuesday coronavirus testing for UK travelers should probably be extended to other countries.

The UK testing was adopted amid concerns about a new coronavirus variant that may be more transmissible. Colorado Governor Jared Polis said Tuesday the state discovered a case of the highly infectious coronavirus variant.

One issue is whether the White House would drop restrictions that bar most non-U.S. citizens from coming to the United States if they have been in much of Europe or Brazil within the last 14 days as part of new testing requirements.

Giroir noted Tuesday the restrictions have led to a 90% to 95% decrease in travel from Britain.