US Defence Secretary Ashton Carter and his British counterpart Michael Fallon made the predictions nearly 10 days into a US-backed Iraqi offensive on Mosul, the last major Iraqi city under IS control.
"It will be within weeks, not many weeks," Carter told reporters at a two-day NATO defence ministers meeting in Brussels.
During a visit on Sunday to Iraq's autonomous region of Kurdistan to review the Mosul offensive, Carter said an operation to isolate IS in Raqa should begin in conjunction with the assault on its Iraqi bastion.
The United States leads a 60-nation anti-IS coalition that has provided key support for the Iraqi army offensive launched last week.
It comes in the form of thousands of air strikes, training for Iraqi forces and advisers on the ground.
The loss of Mosul -- where IS leaders declared their "caliphate" -- would leave Raqa the last major city still under the group's control.
Carter said the idea of simultaneous operations against Mosul and Raqa "has been part of our planning for quite a while."
"We already are working extensively with the Turkish military in Syria" and this had produced "significant" results, including the seizure of the "very important city" of Dabiq.
Earlier this month, Ankara-backed rebels seized the emblematic northern town of Dabiq from the extremist group, having already taken Al-Rai.
"So we are looking for other opportunities including further within Syria, to include Raqa. That's been part of our discussions," Carter added.
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