US Defense Secretary Ashton Carter said Thursday he believes NATO allies will renew or adjust their contributions to the US-led coalition in Afghanistan as Washington extends its mission.

"We anticipate that the US commitment will in turn garner the commitment of other members of the coalition that US forces have operated with," Carter said, speaking the same day President Barack Obama announced plans to keep thousands of extra troops in Afghanistan.

"I've already initiated consultations with key allies to secure their continued support for this mission."