Zlatan Ibrahimovic has admitted that his stunning 40-yard strike on his Los Angeles Galaxy debut was effectively a product of tiredness.

The Swedish forward announced himself in style to his new club's fanbase with a thumping volley from range against city rivals Los Angeles FC.

Ibrahimovic's opening goal came just six minutes after coming on as a substitute, as the Galaxy fought back from three goals down to run out 4-3 winners.

Indeed, the 36-year-old headed home in the final seconds of the match to crown a magnificent derby comeback.

"I felt I played 40 games for my 20 minutes," Ibrahimovic told reporters. "I was feeling everything, jet lag, I didn't play for a long time. I did the first sprint and I was starting to breathe immediately, so when the second came I said this time I shoot, I don't run with the ball.

"You need to adjust for the weather, you need to adjust for the team, the way it plays. We need to have a balance, to save strength for the whole game because under these weather conditions is not easy. But I also think you get used to it.

"If you look back, every team I came to, first official game, I scored. I said I will not let you down. I will score today. I was just waiting to come in. When you lose 3-0, the adrenaline is pumping even more because you want to be able to do something to help the team. The fans were demanding something and I gave them Zlatan."

LA Galaxy are now second in the Western Conference, three points behind Vancouver Whitecaps who have played a game more.