The France international played for Arsenal's Under 21s on Monday against Reading, which was his first action since breaking his leg five months ago - the second time he had suffered the same injury inside a year.
Sagna played just over an hour and he was understandably delighted to be back in action.
"It is amazing to be back, I have been waiting for this moment for five months," Sagna told the club's official website.
"This was my target: to come back and play, firstly for the Under 21 team. Everything went well and we won, so I am very happy.
"I have been working really hard. I spent some time in the rehab centre, then I came back and worked really hard with the fitness coach and the physios to be ready to play - and finally I have.
"When you have such a big injury once, you take it, but twice is hard. In my mind I was a bit sad, but the next day I was ready for the challenge, which was to come back stronger and I am in a good way today."