The Watford Observer understands the Hornets will let the striker leave on loan after he dropped down the pecking order.
Since joining the club from Granada last year, the 21-year-old has scored just one goal in the Premier League for Watford.
However, Marco Silva has yet to give him a chance in the league since he arrived in the summer.
Success has been injured since September due to a leg injury but he is now back in training and Silva is believed to be willing to let him leave next month.
Another forward may be brought in by the Hornets as a replacement but a move down to the Championship could be on the cards for the Nigeria international.
Watford boss Javi Gracia does not think Abdoulaye Doucoure's form will be affected by his omission from France's latest squad.