The right-back came on as a late substitute in the dying stages of the Gunners' 3-2 FA Cup fourth-round victory on Sunday.
It marked the first time Sagna has been on the pitch since October, when he suffered a broken ankle at Tottenham which sidelined him for four months.
The Frenchman admits his spell on the sidelines has been tough but is determined to get back to his best.
"I am absolutely delighted," he told Arsenal Player. "It's been quite difficult all these months - four is a long time.
"I just needed to get back as quick as possible and now I finally am. Now I just need to work even harder to get back because I have only had two training sessions and it is not easy. But I will do it.
"I will still work with the fitness coach but I will only get fit by playing games. I am just biding my time to start a game now but I am not rushing. I just want to give the maximum to get myself into the best position.
"It was nice to have support from my wife, kids and my friends. The fans have also supported me a lot during my recovery and it was quite helpful when I was working."