Watford veteran Matt Jackson admits they'll miss Marlon King if the striker completes his move to Fulham.
Jackson said: "He (King) is a very good player but the situation is up in the air at the moment as to whether he stays or goes. It's hard to say but if he goes and we get a new face in we just hope they (John) can make the impact Marlon has made.
"He is a natural goalscorer and he has taken on the leadership role for us. He has been an asset for us and will be for someone else if he moves on."