Hogg is a former Man Utd younster while Wilkinson is the son of former Leeds United manager Howard Wilkinson.
He was a youth player at Sheffield Wednesday, Sheffield United and Derby County and had a trial with City in January.
Walker said: "I think Steven is six foot three, he's played left back, he's played left-sided centre half, we're trying to select players who can multi-task.
"I know they say men can't multi-task but we're going to get these footballers to do that."
Source: http://news.bbc.co.uk/sport1/hi/football/teams/y/york_city/7448327.stm
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