Victory will give Galaxy top spot for the knockout phase of the MLS Cup.
And Manchester United legend Beckham, 35, says he is playing at full speed again after a six-month battle to recover from the most serious injury of his career.
He said: "Playing has been more of a mental thing than anything else about the injury.
"Now I don't go into games thinking, 'Am I going to do it again?'. Or 'If I push off, will it snap?'. It is something I don't think about."