Clarke suffered medial ligament damage in his right leg during the home defeat to Birmingham on November 9 and the 31-year-old centre-half could be out for another two months.
"It's been frustrating, but I am hoping for some positive news from the doctor this week," Clarke told the Huddersfield Daily Examiner.
"I should get some idea of how the medial ligament is repairing and how soon I might be able to start some rehabilitation work.
"The specialists have already told me that generally, a problem with the medial ligament goes hand in hand with the cruciate being damaged as well.
"In that sense, I have had an escape, so I've taken it as a positive, and I'm looking forward to being able to start some work in the gym."