The 25-year-old has blossomed under Ole Gunnar Solskjaer and contributed two assists in the first half of the amazing 9-0 victory over his former club Southampton, before being substituted at half-time to give him a rest ahead of Saturday's home clash with Everton.
As the clamour grows for Shaw to be recalled to the England side, we asked Irwin for his thoughts on the matter - as there is nobody who knows more about the position than a man who won seven Premier League titles with the Reds.
So, is Luke the best left-back in the division?