New Zealand flanker Adam Thomson's suspension has been extended by a week following an appeal by the IRB.
Thomson was banned for one week for stamping on Scotland's Alasdair Strokosch during the All Blacks' 51-22 win at Murrayfield on 11 November.
But the IRB appealed on the grounds that the independent judicial officer's decision had been unduly lenient.
The appeal committee found that the application of the low end entry point - two weeks - by the judicial officer had not been wrong, and on that point the appeal was not upheld.
But the appeal committee went on to say that the judicial officer's reduction of the entry point from two weeks to one week had not been consistent with IRB Regulation 17, and on that point the appeal was upheld.
The appeal committee therefore considered that the appropriate sanction in this case was two weeks.
Thomson's suspension was extended to apply from 11 November to 25 November, meaning he will be free to play against England at Twickenham on 1 December.
He was not selected in the team to face Wales in Cardiff on Saturday.