Young was brought down by Aston Villa’s Ciaran Clark in the opening ten minutes of the game, and the home side’s manager has said that while there was a connection, it was a soft penalty.
Sir Alex told Sky Sports after the game: “[Young] played for the penalty. The player decides to leave his foot in and takes the contact from the challenge.
“It was a dramatic fall, but it was definitely a penalty, no doubts about that.”
The Red Devils’ manager was full of praise for his team’s performance in the game, which they won thanks to two goals from Wayne Rooney and one apiece from Danny Welbeck and Nani.
He added: “It was a good result and a good performance, the first half in particular.
“In the second half, we were more careless, but the third goal killed the game, and made sure of the result.”
However, Sir Alex has refused to say that the title race between both Manchester sides is over, despite the five point gap over their city rivals.
He said: “There could yet be twists and turns, we just need to keep enjoying ourselves and keep playing alright and picking up points.
“We won’t be getting too confident, as my experience tells you that there is always something that can come back and bite you in the bum!
“We’ll just keep earning points, and that’s all we can do.”