England U21 boss Stuart Pearce insists they perform an important stage in the development of the nation's best talent.
Most club managers abhor international friendlies, especially at such a crucial stage in the season, with the increased risk of injury and fatigue their primary gripes.
But Pearce believes that he is doing some club managers a service by providing their players with some valuable match experience.
"Tom Huddlestone hasn't started recently for Tottenham and it is important to get him some football.
"It is the same with Adam Johnson (Middlesbrough) and Joe Hart (Manchester City) and Fraizer Campbell and Jamie O'Hara (both Tottenham), and there are nine or 10 players in this squad that are not playing regularly for their clubs.
"Them playing games is massively important for the clubs and that can't be lost either - the importance of the Under-21s to help the clubs."
Pearce also insists that he has not received any complaint from Aston Villa manager Martin O'Neill over his decision to call-up Agbonlahor for the under-21 games in Norway on Friday night and against France at Nottingham Forest's City Ground on Tuesday.
O'Neill was angered by Fabio Capello's decision to play Emile Heskey in the friendly against Spain last month despite an Achilles injury, and it was reported that he was similarly unimpressed by Agbonlahor's late inclusion despite a calf problem.
However, Pearce said: "I spoke to Martin early in the week and he has been very supportive to us.