Grante and Umeh will both join up with Tom Mohan for the Republic of Ireland Under-19s, as they take on Bosnia & Herzegovina in a friendly double-header.
These games will be in preparation for their UEFA European Under-19 qualifiers in November.
Jadan Raymond, who scored a 98th minute winner against Manchester United, has also been called up to represent Wales Under-21s. The midfielder will link up with Matty Jones’ side once again as they take on Liechtenstein in a friendly and Lithuania in UEFA European U21 qualifier.
These three additional call-ups brings the number of Academy players called up to five, with Seán Grehan and Killian Phillips representing the Republic of Ireland Under-21s side.