Carsley has also mentioned Crystal Palace midfielder Adam Wharton, who missed out on selection for the senior squad, as a possible candidate to receive match fitness and form help through selection for the U21 team.
In an interview, Carsley stated that both Mainoo and Wharton are being considered for selection, acknowledging that they are more suited to the senior team but still within the scope of the U21 team.
Carsley has maintained contact with both players, who are highly regarded within the England youth system, and has reassessed their eligibility for each camp.