Locked at 2-2 after extra-time, the tie went to penalties, which Leeds won 4-2 thanks to Perri denying Jarrod Bown and Pablo in the shootout.
The Argentine beamed afterwards: “It is the magic of the cup, anything can happen! Today was a crazy game, I think it was a memorable one, and happy that we got to the semifinals.
“We are playing at the highest level of football, and anything can happen in this level. We were able to score two and then in the extra time of the first ninety minutes, they scored twice and forced the game to go to extra time, so we needed to keep our heads steady and focus on the match."
On his shootout saves, Perri added: “The first one was one that we had studied a lot. The other ones were more like we had directions, but it was more of my feeling.
“I am so happy that I could make two saves and help the team to qualify. This is the magic of football! I would say the magic of this fanbase is incredible!”
He concluded: “We are going to celebrate today and now we have a few Premier League matches in between, so we are going to focus on today, celebrate our qualification to the semi-finals and when the time comes, we are going to prepare to have a good game against Chelsea.”