But Parish told the South London Press: "He is an extraordinary talent,' Parish said of the latest talent off Palace's famed production line.
"I said at the start of the season that keeping hold of Wilf would be like spending a lot of money on a transfer. Other sides can fly their kites but it would take £20m before we even got interested.
"He has got the lot, provided he keeps his feet on the ground and continues working so hard on his game - then it will all come.
"People would have to compensate us accordingly for losing his talent - that is what a transfer fee is.
"All the teams have got to understand that you get £60m in TV money if you get into the Premier League, which is where we want to get. So we'd need to be compensated for reducing our chances of getting there."