You can have 10 discovery claims in at any given time and are allowed to make six discovery signings per season:
http://www.mlssoccer.com/2011-mls-roster-rules
Each club has the opportunity to make six discovery signings per season (expansion teams may make 10 discovery signings in their inaugural season). A club may have up to 10 discovery claims on unsigned players at any time and may remove or add players at any time. The last day for discovery player signings is September 15, 2011 – coinciding with the roster freeze date and trade deadline.
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Any reference to "we" means the same thing it did on Simon's board five years ago (i.e. TFC in general or the entire TFC support).