The 17-year-old marked his full debut for the club with the winner at Gillingham in October.
Brownhill has been promoted into the first team after some stunning form for the youth side, which saw him claim six goals in eight games.
Now Brownhill has seemingly emerged as a fully-fledged member of Simon Grayson's first team - however, he is yet to sign a professional contract.
Now Preston are in talks to hand Brownhill a long-term deal as sources close to the club have told Sky Sports that Man City, Arsenal, Liverpool, Tottenham, Fulham, Stoke, Swansea and Southampton are amongst the clubs to have checked on him in recent weeks.
A spokesman for Cassius Management, who represent the player, told Sky Sports that they could not confirm any interest in the player, saying. "Josh is very happy at Preston having made his debut and wants to repay the manager, club and fans for their faith in him.
"We will hold talks with the club over a professional deal for him and that is all we can say at the moment."