Chairman Nigel Doughty has revealed money is available but Hart still remains tight-lipped on the situation.
Forest lost out on Shaun Goater, David Connolly and Danny Webber in the summer but Hart's next bid remains a secret.
Reports have suggested Sunderland's Tore Andre Flo and Tottenham's Sergei Rebrov could be potential transfer targets but the rumours have died down in recent weeks.
The latest name in the frame has been Burnley's Gareth Taylor but Hart is likely to try a loan for a Premiership striker similar to the Darren Huckerby deal last season.