The Brazilian was linked with Tottenham Hotspur, Chelsea and Arsenal after making a positive start to his Hornets career, and he has refused to rule out the possibility of playing at a higher level.
"Look, everybody wants financial security for their family, and when a player says otherwise, he's lying. If I play at a really high level, opportunities will come my way," Richarlison told FourFourTwo.
"But right now my mind is focused on Watford. I will raise my level. I think about playing in the Champions League and being the top scorer in the Premier League."
Richarlison scored five times in his first 13 appearances for Watford, but has not found the net since last November.