[MLS TRANSACTIONS] The Vancouver Whitecaps signed 33-year-old Scotsman Barry Robson as a Designated Player. Themidfielder will join the Caps this summer after his season with English League Championship club Middlesbrough ends. Robson, who has 17 caps for Scotland, moved to Middlesbrough in 2010 after spendinghis entire career in Scotland. Former Cameroon Olympic player Franck Songo’o signed with the Portland Timbers after impressing in recent preseason action. Sonof former Cameroon goalie Jacques Songo’o, Songo’o spent time in Barcelona’s La Masia youth academy before jumping around to five clubs in England and three inSpain. The Colorado Rapids acquired 22-year-old playmaker Martin Rivero on loan from Rosario Central of Argentina’s Primera B. For all the offseason playermovement …

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