The Arsenal forward admits he was disappointed to have been on the sidelines for longer than initially expected but says he is expecting to return to form very soon.
The 24-year-old came on as a second-half substitute during the Gunners’ 2-0 win over the Saints at the Emirates Stadium, his first appearance since September.
And Walcott feels it will not take him long to return to top form, especially since he is relishing being back on the pitch.
"It is a challenge I can face, I have faced some in my short career so far," Walcott told reporters. "It is nothing new to me, I know how to deal with it all. I have some fantastic people around me and know how good I am. I am sure I will be back to my best very soon. It has been longer than I thought but it is so good to be back out on the pitch with the guys and playing in such a fantastic team.
"Seeing the way we play football has been fairly pleasant to watch [from the sidelines], but any player who is injured wants to go out there and perform."
Arsenal's next action comes against Olympique de Marseille in the Champions League midweek.