The Norway midfielder had been out of action for nearly two months, but played in a 1-1 draw against Chelsea on Sunday.
While Odegaard could not inspire his team to a win, but knows there is plenty of time to improve.
Post-game, he told Sky Sports: “Unbelievable… back doing what I love. It has been a long time, the longest I have been out of football in my whole life. It felt good to be back out there although disappointed we didn’t get the win.
"We’ve done a lot of work with the fitness coaches and physios pushing me every day. I wanted to come back as soon as possible. I felt okay today. I didn’t expect it (to play 90 minutes). I’ve only done three training sessions with the team or something.
“It is a long season, long way to go. We had a tough period in December last season and came back. We know the quality and mentality we have and we just have to keep going."