The teenage forward is considered one of the brightest prospects in the Championship, and is also said to be attraction attention from Premier League clubs Leicester, Everton and Wolves.
Gelhardt made his professional debut in April and featured in Wigan's 0-0 draw with Barnsley on Saturday.
The Latics starlet has already gained a reputation as one of the most promising youngsters in the country.
Several Premier League clubs are expected to send scouts to watch Gelhardt in action for England's Under-18s against Australia on Friday.
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Greg Lea is a freelance football journalist who's filled in wherever FourFourTwo needs him since 2014. He became a Crystal Palace fan after watching a 1-0 loss to Port Vale in 1998, and once got on the scoresheet in a primary school game against Wilfried Zaha's Whitehorse Manor (an own goal in an 8-0 defeat).
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