According to The Nottingham Post, Forest will take their time to consider the offer and have not made a decision on Mancienne’s future.
The report claims that Forest manager Dougie Freedman will hold talks with the former Chelsea player over his long-term plans this weekend.
Should Nottingham Forest sell Michael Mancienne?
Mancienne has been on the books of Forest since the summer of 2014, when he joined them after leaving German club Hamburg.
The defender is an important part of the team, and Forest should try to keep hold of him for the 2015-16 campaign.
The former Chelsea centre-back created eight chances in 36 Championship matches last season.
Mancienne had a pass accuracy of 78% and a shot accuracy of 57%, and won 116 headers, 10 dribbles and 51 tackles.