The 32-year old Canadian international joined the Latics on a deal lasting for the remainder of the English season following a successful trial with the Greater Manchester club.
He first played for the Whitecaps in 2010 when they were in the USSF Division 2 before becoming part of their inaugural MLS roster. Dunfield was then traded to Canadian rivals Toronto in mid-2011 before he was waived last year.
On Saturday, the former Bury, Macclesfield Town and Shrewsbury Town midfielder came on as a second-half substitute as the Latics edged Gillingham 1-0 at Boundary Park to move up to 14th on the English third tier table.
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