According to himself, Walter Zenga was one of the candidates to replace Walter Mazzarri. The Inter legend tweets:
“They chose Mancini. I was in the race, my dream was close. Unlucky, maybe in another life. Thank you all”
Source: https://twitter.com/wz1945

I truly love your passion Walter. True Interista. But for the seat of Inter, it must be earned. I think at least he should coach in Italy first! He has hardly done that. You need to prove yourself like Mihajlovic. Just saying !!
I feel bad for Zenga but at the same time I don’t think he has the quality yet to truly take over a team like Inter.
Damn, he’s really motivated to coach Inter. I feel sorry for him. Sacking Mazzarri must have been a really hard decision for Thohir, given the current situation and time. Choosing Mancini’s experience and stability seems the right decision right now. Next time, Zenga.
a true lengend but he needs to prove himself first, just like mihajlovic and simeone have done!
but there’s time, Zenga you will definetly coach Inter some day
You are one of the best heros in Inter’s history, But maybe another time
poor guy he always comes up as the runner up