The 19-year-old impressed in a makeshift United line-up, and after two years of injury heartache Ferguson believes the midfielder is now ready to make his mark at Old Trafford.
"Darren has a chance," said Ferguson.
"He has had a difficult start to his career at the club, suffering a broken foot which fractured again when he came back too soon, then missing 10 weeks with an ankle injury.
"He was also physically very immature.
"He is still skin and bone really but he has very good ability and there is a lot of common sense about his play."
The Scottish supremo also had words of comfort for another young prospect, Kieran Richardson, who had a night to forget in the 1-1 Champions League draw with the Swiss outfit after being substituted at half-time.
"He (Fletcher) is a year older than Kieran and that probably helped him last night.
"In contrast, Kieran is still a youth team player and he found it difficult.
"When you bring young players in like that, they don't always respond simply because we are trying a team which has never played together before.
"It made it difficult for the lad but he will be okay. His day will come."
