David Beckham will have a pain-killing injection in order to be fit for Sunday's MLS Cup final, the Los Angeles Galaxy midfielder said.

Beckham, 34, has been struggling with a bruised bone in his right ankle during the Galaxy's run to this weekend's Major League Soccer title decider against Real Salt Lake.

The England star took part in his team's training session at a rainy Qwest Field on Friday, his first involvement in practice since last Friday's Western Conference championship victory over Houston.

"Today was the first day I trained, unfortunately," Beckham said. "It's been frustrating but with bone bruising you've got to be careful with it, not get any kicks on it.

"But I'm sure it will be fine for Sunday, it will definitely be fine. It's just one of those things you have to get through and after five or 10 minutes of the game I'm sure I'll forget all about it."

Asked whether he would be needing an injection before the game, Beckham said: "Yes, definitely.

"It's part of sport and if you want to be involved in certain games you have to make certain sacrifices, that's the way it is.

"It will be fine."

Beckham, who will return to AC Milan for a second loan spell on December 28, said winning a league title in the United States would mean as much to him as his championship successes in England with Manchester United and in Spain as a Real Madrid player, when he collected a La Liga winners' medal in his final season at the Bernabeu in 2007.

"I think in any sport success is something that never gets old," he said.

"I've been able to play in great leagues and play for big teams and winning championships and cups with those teams is always exciting.

"So is this. This is the first time I've been in the play-offs and the first time I've been in the MLS Cup. I'm proud to be on this team and it's been an exciting season for us.

"But it's not over yet. We still want to go into this game on Sunday and play well and win. We won't be happy if we don't do that.

"But it's been a successful and enjoyable season."