Newcastle came from behind to win the fourth round tie 3-1, with Tonali scoring twice.
He later told the club's website: "It's important for the team, because it's the second win in a row away, and for me it's important because it's the first two goals in my season. I've started a little bit late, but every time when you score, your game and your day is different!
"I've tried to score for the last two months a little bit more - but the first most important thing always is the team.
"I'm happy especially for Nick (Woltemade). He played as a midfielder and he played very well and he scored the last goal. And I'm happy for for every player, for every member of staff, for all the fans.
"Today was an amazing game; we played very well. This game is so important because we have one dream: to come back to Wembley."
On his goal celebrations, Tonali also explained: "The first one, this celebration was, I think, seven months without scoring; if you don't score for seven months, after the first goal, you celebrate for ten or 11 goals - like Bruno (Guimarães)!
"But after the second goal, I came to Eddie (Howe) because in the past few weeks, people spoke about our relationship, but I work every day with the gaffer, the gaffer works every day with me, and our relationship is perfect. It's not broken and I think this is perfect for the team.
"We try to do the best for this team, every game, because we play a lot of games - every three days, we play, and we have to be concentrated every time in the training ground to do the best for our team."