Vancouver Whitecaps are close to selling out this weekend's derby clash with Seattle Sounders.

Less than 700 tickets remain for the BC Place fixture between the Western Conference's fifth and fourth placed sides respectively.

The Whitecaps require a win to ensure a playoffs berth this season with FC Dallas breathing down their necks just two points behind in sixth position as the Sounders sit 10 points clear and are assured finals action.

A capacity crowd of 21,000 is expected on Saturday as the Whitecaps look to qualify for the MLS playoffs for the first time after entering North America's top flight in 2011 and the match marks yet another instalment of the Cascadia Cup which also includes both clubs old NASL rivals Portland Timbers.

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