The Leicester-born prospect, who has spent around a month on loan at New Bucks Head, made just two appearances for his temporary team as he was made unavailable for their Emirates FA Cup outings, ruling him out of two crucial games.
After missing the cup clashes with Bedford Town and Warrington Town the 19-year-old failed to return to action as Bucks boss Gavin Cowan opted to keep summer signing Steph Morley in the line-up forcing Callum to watch from the stands.
Callum, who often forms part of John Ward's development squad, is not expected to return to Telford for another loan and is likely to be sent out to a new club as he continues to work towards earning a spot in Dean Keates' matchday squad.