Guehi has been a foundational piece of Palace's side for a number of years, and will forever have a place in the club's folklore as the captain that lifted their first piece of major silverware. His market value, however, is diminishing. The Magpies valued him at £65m ($87m) last summer, but while his stock as a player has risen, his reticence to sign a new contract in south London makes him a rapidly depreciating asset.