AS Monaco and Besiktas are reportedly interested in signing Nigerian/Italian striker, who wants a Winter Transfer Window which opens on January 1 2019.
Okaka, 29, has scored five times in 35 appearances for the Hornets since joining them in 2016, and it is understood that he has already decided to seek new pastures.
According to gianlucadimarzio.com, AS Monaco and Besiktas are both chasing the experienced striker, who has represented the likes of Roma, Modena, Spezia, Fulham, Parma, Bari, Sampdoria and Anderlecht during a well-travelled career.
Monaco will face competition from Besiktas to sign the big forward.
As confirmed by his agent and brother, Carlo Okaka, former Italian international striker Stefano Okaka is leaving Watford soon.
He is on deal with Watford until June 2021.
With Okaka appearing to be frozen out of the first team picture, this is a move that could suit all parties, although it is unclear as to whether the move would be an initial loan or permanent transfer.