Then, after building up his fitness in Dubai during the summer, he started the first five fixtures of 2015/16.
A broken leg interrupted his progress and the 23-year-old was restricted to 22 PL outings between that injury and the end of last season.
But he made his mark in the opening fixture of 2018/19.
He scored his first-ever PL goal to secure a 2-1 victory against Leicester and will hope to build on that performance when the Red Devils visit Brighton & Hove Albion.
Speaking to his former coach Ryan Giggs in the video above, Shaw says: "Mentally, over the summer, it was quite hard. I really wanted to be at the World Cup and it pushed me on even more during pre-season.
"Back in the second season with [Louis] van Gaal, I did a trip to Dubai and came back feeling really good. It's similar to this time. I did it again.
"I've come back really fit, ready to go, and I think this is my season hopefully."