The 35-year old Englishman was struggling with a groin strain early in the 3-0 defeat but soldiered on in an attempt to get his team back into the match after David Ferreira opened the scoring just before the half-hour mark.
“We saw at the beginning of the game, probably 15 minutes in, that he had a problem,” said Arena.
“We talked to him at half-time. There was a chance that we were going to take him off but he stayed in there.”
Donovan added: “He has been playing through a lot of pain in the last few weeks, more than you know.
“When you come back that quickly at that age from an Achilles injury, there are going to be side-effects.”
Click the following link to see Becks’ reaction to the loss to Dallas: http://www.tribalfootball.com/tribaltv/david-beckham-and-la-galaxy-miss-...