Ranieri left after a defeat by Juventus stretched eighth-placed Inter's poor run to six losses in 10 games as the 2010 European Cup winners face up to the prospect of no Champions League next term and no trophy for first time since 2004.
Inter's biggest problem is their ageing side and little-known Stramaccioni has been promoted for at least the rest of the season after leading Inter's youth team to victory in the NextGen Series at the weekend.
"Young people are an asset and the club together with the coach will decide how best to manage them," the 36-year-old told reporters at his presentation on Tuesday.
"The assessment of when and how to do it is an important and delicate thing because you can take a risk and rush the evolution of a young man. But I think the president has already given a signal."
He said youth must be blooded and Stramaccioni immediately brought Andrea Romano, Ibrahima M'Baye and Marko Livaja into the first-team squad for his first training session as he looks to convince Moratti to give him the reins long-term.
"I come from achieving a great triumph, a success of everyone, of a youth sector of the highest level," he said.
"Now I am living something totally unexpected, a dream which president Moratti has presented to me and which I will do everything to honour to the best of my ability."
Stramaccioni, a former Bologna player whose career was halted early by injury, had only been Inter's youth coach for less than a year having joined from a similar role at AS Roma.
With UEFA's new financial fair play rules threatening Inter's long-standing reliance on benefactor Moratti and expensive spending on big names, youth could be the future.
The head of the Italian league managers' association Renzo Ulivieri and the Italian federation's youth director Arrigo S
