Burnley, Millwall and Bristol City are also said to be interested in the Southend stopper.
Bentley has been a mainstay in the Shrimpers side for the past two seasons, despite his tender years, and his good form appears to have caught the eye.
Burnley, Millwall and Bristol City are also thought to be interested in acquiring the 21-year-old, according to a report in the Southend Echo, as rumours start to grow ahead of the January transfer window.
Bentley has shown his ability to be commanding, while his shot-stopping has also been eye-catching and Southend manager Phil Brown admits that he faces a fight to be able to keep his star man at Roots Hall.
“There has been a lot of enquiries made about Daniel and I certainly expect a bid to be made for him during the January transfer window,” Brown said.
“I obviously want to keep him at the club but it will be a challenge for me and a challenge for the football club as well."
Bentley has conceded just 15 goals in the 19 games he has played in League Two this season, helping his side into the playoff spaces. A move up the divisions could be too tempting for him to turn down, though.
Forest are on the hunt for a goalkeeper due to the impending departure of current number one Karl Darlow.
Darlow will join up with Newcastle United at the end of the season, meaning that Stuart Pearce's side may see Bentley as the natural successor to his position.
Robert Green is the R's current first-choice and, given his fine form this campaign, he is unlikely to be replaced any time soon.