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There are a lot of potential one week cheap replacement options as well as a note speculating that Landon Donovan is likely to be back in action sooner rather than later which has implications for Donovan, Robbie Keane (who will get more help), and others in the LA Galaxy line-up that will either be helped by the additional attacking fire power or hurt by the loss in playing time.
Here's the link to help you with your last minute preparations.