Pereyra saw action in their 1-1 draw with Palermo yesterday.
Guidolin remarked: "Roberto Pereyra is a young player who needs to learn so much and still has to settle in, but he has quality. I have to compliment the club on finding this talent who can do great things here.
"Gabriel Torje is also growing and can give us a lot going into the future. This team perhaps lacks some maturity, as we don't always get the results that we deserve."