The Chesterfield striker is being chased by Burton, Charlton and Bradford
Dennis has been Chesterfield's standout performer for Chesterfield so far this season and is currently second top goalscorer in League Two despite Chesterfield's problems at the wrong end of the table
The prolific forward has scored 13 goals in all competitions for the Spireites and he has established himself as a key player at the club since joining the club on a free transfer in the summer of 2016.
Dennis finished as Chesterfield's top scorer last term scoring 10 goals in 42 appearances in his first campaign in the Football League.
The 27-year-old impressive form at Chesterfield during the last 18 months has not gone unnoticed among clubs higher up the football pyramid.
Championship strugglers Burton are weighing up a move for Dennis as Brewers boss Nigel Clough has made striking reinforcements his top priority when the transfer window reopens in January as he looks to bring in a goalscorer to fire his side to safety.
Several League One clubs including the likes of Bradford City and Charlton Athletic are also monitoring Dennis as they look to bolster their attacking ranks in January.
Dennis is entering the final six months of his contract at Chesterfield, but he is understood to be happy at the club working under Jack Lester.
Chesterfield would be reluctant to lose Dennis as they battle to avoid relegation from League Two, but they are bracing themselves for interest in the striker in the New Year.