Roberts, who has joined the Catalan club on loan from City for the season, played the final 10 minutes of the draw with Real Valladolid on Friday.
Following his debut, he was officially presented as a Girona player on Monday, saying “coming to Girona was the best decision I could make."
Roberts believes that joining his new club and the chance to play in the Spanish league is “a good opportunity" for his career.
“To be able to arrive and make my debut [so soon] was really good for me, it was fabulous," he added. “I want to contribute as much as I can to play as many games as possible."
Next up is Real Madrid on Sunday: “We hope that we can get a good result. Playing teams like [Madrid] is a huge motivation for me."
Girona's sporting director Quique Carcel explained: “Roberts can add a lot of good things to the tam. I and convinced that he will perfectly adapt to Eusebio's system. He will add depth, balance and a lot of hunger."