South Korea's top trade negotiator said on Sunday he would raise concerns about potential U.S. restrictions on chipmakers in China when he meets U.S. officials in Washington this week for the third round of technical discussions in tariff talks, Reuters reported.

"I will pass on the concerns among those in the industry and take utmost care," South Korean Trade Minister Yeo Han-koo told reporters before leaving for Washington, when asked to comment about concerns the U.S. may adopt policies to make it difficult for foreign chipmakers to operate in China.

Yeo also said Seoul may not stick to the July deadline, suggesting talks may continue beyond July 8 amid political and economic uncertainties in the U.S.

South Korea, currently subject to a blanket 10% tariff with a 25% country-specific duty on pause for 90 days, agreed with the U.S. in their opening round of trade talks in late April to craft a trade deal reducing tariffs by July 8, according to Reuters.