With the busy Christmas period about to start and the Manchester derby on the horizon, let's hope Shaw keeps himself fit as he is surely going to get chances in the coming weeks.
This was the Shaw of old and, if he can retain his fitness, he could still become one of the best left-backs in Europe as many touted during his days at Southampton.
Before the game kicked-off, Paul Scholes, Rio Ferdinand and Steven Gerrard questioned Shaw's professionalism and asked why a player of such obvious talent has not been used more often by Mourinho.
Shaw has endured a hard 18 months under Jose Mourinho and has been criticized for his below par performances.
At 22, Shaw is a long-term investment that could reap huge dividends for Tottenham chairman Daniel Levy, even if some of the club's fans remain wary.
On Saturday Ashley Young played as a full-back, and while the former Aston Villa man has been superb in the role and deservedly was nominated for the November Player of the Month award.
Mourinho told Shaw ahead of Tuesday's game that it was not a test, but more so an opportunity to play.
However he took his chance against CSKA Moscow with both hands, putting an impressive performance as he completed a full 90 minutes.
The England global had played only 48 minutes of EFL Cup football this season - both of which came from the bench. He's the best left-back at the club, there's no doubt about it", "I don't think he'll play on Sunday having been out for so long. The player has a lot to show to Mourinho to convince the Portuguese manager.
"Shaw put in a very positive performance, especially in possession", he told a news conference.
"He was waiting for quite a long time, he was deserving [of his chance] for quite a long time".
It is now up to Shaw to decide if he wants to fight for his future at Manchester United, and on last night's showing it appears he does.