Roma new signing Oliveira has only been with the team for a few days and decided the game on their debut.
Oliveira, 29, joined Roma on loan from Porto for six months.
This is an important reinforcement for Mourinho and Roma.
His debut for Roma was perfect and the players are looking to maintain a high level in the following matches.
In this match, Oliveira won a penalty for Roma and personally took the penalty shot to help Roma win the game.
Before Oliveira arrived, Roma's penalty players were Pellegrini and Villertour.
However, oliveira changed that when he joined.
New signing Oliveira explained why it was his penalty in the game.
Oliveira said: Lorenzo Pellegrini was the first striker, but he missed the game due to injury. We have agreed that I will be the second option. I'm glad the team won.
After the game, media reporters asked Oliveira what are Roma's goals for this season? Can I finish in the top four of the league?
Oliveira's response was mature, he said: "We have to think about just one game at a time and then see where we will go.
The Porto midfielder also spoke about how he felt when he first arrived at Roma, with Oliveira saying: "It's a great feeling. I thank everyone, coaches and teammates. I played in that position and did what Mourinho asked me to do. These 3 days have taught me how the team plays, and I have seen some tactical arrangements. Although I was new to the city, I felt very relaxed. It's a great feeling. Because I know how special it is to play in this stadium, in this city. Our fans are extraordinary, and it's a shame I didn't make my debut in front of a full stadium and I hope it's going to be full again soon.
Oliveira became a key player in his debut at Roma. He has performed well throughout the game and hopefully he can continue to be at a high level and be a strong complement to Roma.