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The Vancouver Whitecaps signed Greg Janicki, left, to its MLS roster on Friday. ((Canadian Press))

The Vancouver Whitecaps added depth to their roster Friday by signing midfielder Terry Dunfield and central defender Greg Janicki.

Terms contracts were not released.

The Whitecaps, along with the Portland Timbers, are slated to join Major League Soccer in 2011 as the league's 17th and 18th franchises.

Whitecaps coach Teitur Thordarson heralded the signings, calling both players "very professional."

"Terry has played soccer at a very high level in England, and we will benefit from the experience he will add to our team as we enter our inaugural season in MLS," Thordarson said in a statement.

"Greg is a player with huge potential and continues to mature as a centre-back. His performances last season gave us the confidence to add him to our MLS roster." 

Both Dunfield and Janicki played for Vancouver in 2010 during the club's final season in the United States Soccer Federation Division-2 Professional League, the North American second division.

Dunfield and Janicki join goalkeeper Jay Nolly, right defender Wes Knight and midfielder Philippe Davies, who played for Vancouver last season and were rewarded with MLS contracts.

Dunfield, a 28-year-old native of Vancouver, made his debut for the Canadian national team on May 29, 2010, when Canada earned a 1-1 draw against Venezuela in an exhibition game.

Janicki, 26, was named the USSF D-2 Pro League defensive player of the year in 2010. The Michigan native was also named to the league's all-star team.