The 17-year-old is viewed as one of the Championship’s hottest prospects, and will this week represent England at U18 level for the first time.
Born in Netherton, Gelhardt is a boyhood Liverpudlian but joined Wigan as a 10-year-old, and his progress since has been noted by the Reds.
Gelhardt, despite being on the losing side, impressed for the Latics against Liverpool in the fifth round of the FA Youth Cup back in February, a game attended by Alex Inglethorpe, the Reds' Academy director.
The left-footed frontman made his senior debut for Wigan as a 16-year-old, appearing in an EFL Cup defeat at Rotherham in August 2018.