21-year-old Forbes scored hundreds of goals in non-league football and attracted the interest of the Wednesday boss.
But Turner believes that the hitman will not be experienced enough and could prove to be a bit of a risk.
Turner is ready to up his bid for Blackpool's Scott Taylor and sources close to the club believe that a deal has nearly been concluded.
Luton marksman Steve Howard is still continually linked but a cheaper option would be Stockport County's Wednesdayite Luke Beckett, despite them already turning a bid down of around £100,000.