A spokesperson for the club said: "We have no comment to make on the future of Neil Lennon at this time."
The 36-year-old moved to the City Ground on a one-year deal in the summer after seven years with SPL champions Celtic.
Lennon's agent Martin Reilly insisted Lennon had not walked out on Forest but confirmed there were issues which needed to be worked around.
Reilly told the Nottingham Evening Post: "He was given some time away from the club to resolve personal issues, which is why he was not part of the squad last night.
"We are planning to meet with Colin Calderwood to discuss a few minor issues, but the main factor is simply that while Neil lives in Nottingham, his girlfriend and young child are still up in Glasgow."
Reilly stressed all parties concerned are trying to find a way to resolve these issues.
He added: "Neil remains fully committed to the club. He is trying to find a solution to these issues, but he has certainly not left Nottingham Forest.
"I am not certain whether he will be playing for them on Saturday - that is one of the things we have to discuss."