Rovers agreed a move for full-back Whittle last week, but the paperwork has yet to be processed and he will not feature against Wycombe on New Year’s Day.
Keanu Marsh-Brown could return to the starting line-up after being troubled by a calf injury in recent weeks.
But Dale Bennett is set to be missing for the third successive game with an ankle problem.
Adam El-Abd remains doubtful for Wycombe after missing out against against Mansfield
The defender has missed the last three games and could extend that run to four with just one more day to recover as the frantic festive period comes to a close.
Fellow centre-back Anthony Stewart is also likely to be unavailable again.
Forward Scott Kashket is another absentee but is hopeful of a comeback soon as as he continues to work his way back from a pelvis problem.
Burton midfielder Martin Samuelsen will use the international break to recover from illness after pulling out of Norway U21's games.
Jonas Lossl is staying 'optimistic' over Huddersfield's chances of survival this season and has urged his team-mates to 'go for it'.