The £11.5m summer signing from Fluminense has five goals and four assists to his name in the Premier League this term, all of which came before Christmas.
With three of the country's top sides circling, the Brazilian forward is keen to continue doing his talking on the field.
"In the future you never know but I leave all things like that up to my agents," he told the London Evening Standard. "At the moment my head is completely in Watford.
"I am not thinking about anything else and I want to help the team get as far as possible in the League. That is my objective, that is my focus and nothing else."
Richarlison last scored or assisted a goal in the 2-1 defeat to Crystal Palace on December 12.