HITC Sport understands a number of clubs are tracking non-league defender Pinnock.
Rotherham United, Charlton Athletic and Millwall are all eyeing moves for Forest Green defender Ethan Pinnock when the transfer window reopens in January, HITC Sport understands from sources close to the club.
Pinnock has impressed for Forest Green since his arrival from Dulwich Hamlet in the summer and he has been an ever-present in the National League this season.
The 23-year-old has been instrumental in Forest Green's push for promotion with the side currently sitting in second spot in the National League table.
The left-sided centre-back's performances have not gone unnoticed higher up the football pyramid and scouts have been flocking to the New Lawn to cast an eye over Pinnock.
Millwall have held a long-term interest in Pinnock and tried to sign him last January when he was at Dulwich Hamlet only for an injury to curtail any move.
Championship strugglers Rotherham are in the market for defensive reinforcements in January and they have been scouting Pinnock regularly this season, while Charlton are also looking to add to their squad in the New Year as they look to mount a bid for promotion back to the Championship.
Forest Green are reluctant to lose Pinnock as they look to maintain their push for promotion to the Football League, but they are bracing themselves for interest in the defender when the transfer window opens again next month.