The phrase "to know a fan" means to understand or be familiar with someone who admires and supports a particular person, team, or thing. Full definition
As such, known fans of the film will be glad to buy a disc they've been waiting years for. (dvdizzy.com)
We're right to be angry, fed up, but look at it from a players perspective, would you join a team knowing the fans like you do. (justarsenal.com)
The players very well know fans are demanding for more signings and they know even if they lose a few games the players will not be blamed for that. (justarsenal.com)