Beckham played a full 90 minutes for the LA Galaxy against New York Red Bulls at Giants Stadium on Saturday night.
He said: “I was surprised to actually play 90 minutes.
“The manager and coaching staff kept asking me if I wanted to come off, but I am quite a stubborn person on and off the field.
“When we were winning I didn’t want to come off and when we were losing I didn’t want to come off either.
“My ankle took a pounding – I am not used to this artificial surface and there were a couple of instances where I rolled over on my ankle. It is more swollen than it was before the game but I am sure it is going to be fine for Wembley.”
