The Barnsley defender, on loan at Ipswich, says that a brief experience at Old Trafford can serve him well.
The 21-year-old spent two weeks at the Red Devils last summer on trial from his parent club Barnsley, before joining Ipswich in January until the end of the season.
The highly-rated Digby made his league debut with a late substitute appearance against Huddersfield on Saturday, and he hopes that the lessons he learned at Old Trafford, alongside a number of current United prospects, will serve him well going forward.
“I had two weeks with United. That was unbelievable. I will remember the lessons from that for the rest of my life,” he told Town's official website.
“I played in a couple of friendlies and I reckon there are eight or so of the players that I worked with there that have played for the United first-team this season - boys like [Guillermo] Varela, Marcus Rashford, Donald Love and Cameron Borthwick-Jackson.
“They are all good enough to play in the first-team because they work so hard. It’s inspiring to see the boys there making their debuts in the Premier League."
The 6'4 powerhouse, who has three caps for England Under-21s, played for the Red Devils' Under-21s during his two-week trial.
He will be hoping to get more Championship minutes under his belt in the coming weeks and months, having replaced Freddie Sears in stoppage time at Huddersfield.
But with Ipswich chasing a playoff spot, it remains to be seen if Mick McCarthy will take gambles between now and the end of the campaign.
They sit ninth in the Championship, four points behind sixth-placed Sheffield Wednesday, who have played one game more.