The hugely experienced openside left the field early during the 16-15 victory at the Arms Park and it was feared that he would need an operation before he could return to action.

However, a scan has revealed that is not the case, although Williams has torn a ligament on the inside of his left ankle.

The 33-year-old double Lions tourist is expected to be back playing in time for the Blues' opening Heineken Cup pool fixture against Calvisano on October 11.

That would see the 81-times-capped former Pontypridd man remain in contention for a place in the Wales squad for the forthcoming autumn internationals against South Africa, Canada, New Zealand and Australia this November.