Two years ago, Ferguson claimed Welbeck was good enough to force his way into the Fabio Capello's World Cup squad but the 21-year-old only made his England debut last March and has subsequently made substitute appearances against both Montenegro and Spain.
But Ferguson is in no doubt Welbeck will make Capello's final cut for this summer's Finals in Poland and Ukraine, and said: "I think he will be (in the squad)."
He added: "He is developing into a very strong athlete and when he gets moving, he is really quick.
"He was always a decent goalscorer but when he plays regularly for us he has been getting a goal a game."
Welbeck was part of the new wave of Red Devils that took the early weeks of the campaign by storm.
However, after a month on the sidelines with a muscle injury, Welbeck has hit a rich vein of form, scoring four times on his last six appearances and taking his tally to three in three games with his late winner at Arsenal last week.
"We expected him to do well this year," said Ferguson. "We did the right thing sending Danny to Sunderland last season.
"The issue with him now is the physical side. When he was 16 he had problems with his knees because he was growing, then he had some thigh problems.
"It was nothing serious, just a matter of waiting for him to develop into a man, which we are seeing the signs of now. He has a great physique but there is still more to come."