Town's increasingly stretched senior Academy sides are in action away at Leicester and Derby on Saturday lunchtime.
The U19s travel to Leicester's Belvoir Drive training ground (KO 12pm) while the U17s begin their play-off campaign with a visit to Derby's former home at the Baseball Ground (KO 12.30pm).
Both Town sides have been hit by the progress of so many players into the first team. Joe Royle's squad for the match against Brighton contains Darren Ambrose, Darren Bent, Matt Richards, Ian Westlake and Dean Bowditch, all of whom are eligible for the Academy sides.
On top of the senior call-ups there are anumber of injuries, Matt Robinson is out with an broken ankle, Guy Bonwick with an injured hand and Marc Smith with a back problem.
Matt Bloomfield is expected to be back from being away with the England U20s who drew 1-1 in Switzerland on Wednesday.