The 19-year-old duo were part of a United team that was strong defensively throughout the 90 minutes apart from a few hiccups including the corner for West Ham’s goal.
Both could have been easily overawed by the occasion which was a real pressure game but they instead took it in their stride.
It was the perfect start for their United careers and Louis van Gaal will have been impressed with how they coped with the occasion.
Here’s what a few United fans thought of their performances and the reaction was overwhelmingly positive which is a testament to how well they both played:
Just watching the game in full, am I the only person who thinks Shaw's poss got a great leap? I'd love to see him go for attacking headers
— Take A Bow Falcao (@ConstantRed) September 28, 2014
Thought McNair was excellent today. Really impressive debut. Shaw/Rojo also good. Rafa definitely showing improving form this season. #MUFC
— Rob B. (@_Rob_B) September 27, 2014
For me, Shaw & McNair both had a great debut, very solid & confident in themselves. Rojo seems better as a CB. #MUFC
— Med (@ManUnitedMed) September 27, 2014
Shaw and McNair had great debuts, looked really composed at the back. McNair also made a brilliant clearance off the line in the 2nd half.
— Hannah (@Little_Aig) September 27, 2014
Thought Shaw had a very good game today & Rojo looked much more comfortable centrally. Love Fletcher but he's not Utd level anymore IMO.
— Pilib de Brún (@Malachians) September 27, 2014
Luke shaw was class today
— Andy charman (@Andy_charman) September 27, 2014
That McNair clearance is phenomenal. Great debut for him & Shaw.
— Aran Sohal (@AranSohal) September 27, 2014
Missed the match but Twitter summary seems to be: *McNair, Shaw, & Herrera outstanding. *Ref shocking. *Rooney brainless. *Fans exhausted.
— Jon (@JonWilmot44) September 27, 2014
What did you think of Shaw and McNair’s performance?