Gabriel kept a clean sheet in the 1-0 win over Udinese.
"It was a great debut for me and I am very happy," he told Sky Sport Italia.
"Of course there's going to be a little tension at the start, as this was a difficult game we had to win. We slowly started to gain confidence and it went very well at the end."
It wasn't too simple for him, as Gabriel had to fingertip an Antonio Di Natale free kick on to the crossbar.
"The Coach had already warned me Di Natale took great free kicks and I had seen some of his games before. When I saw it was his free kick, I expected him to go near post and thankfully I was able to get a hand to it."
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