Forest are pushing to sign the forward this summer and have already tabled a bid with Watford to snap up Dennis.
The newly-promoted Premier League side have offered a deal worth £20m to Watford for the signature of the striker this summer.
Steve Cooper wants a deal done soon as he pushes to add more attacking options to his Forest squad in the ongoing window
And according to French outlet Foot Mercato, the negotiations are at an advanced stage for Dennis to move to the City Ground.
It has been claimed that the two clubs are progressing in talks and a deal could be in place for the transfer soon.
Nottingham Forest could finalise the deal to sign Dennis from Watford by the weekend if the negotiations carry on at the current pace.
The Watford striker scored ten goals in the Premier League despite his side’s relegation from the top tier.
Several teams have been interested in him but Nottingham Forest are moving towards getting a deal done to sign the striker.