Chelsea are due a bumper windfall should Crystal Palace sell Marc Guehi this summer.
The defender is a target for Arsenal ahead of the summer market.
The Daily Mail says Chelsea boast a 20 per cent sell on clause in Guehi's deal
For their part, Palace have slapped a 50m on the cente-half who has played his way to the fringes of the England squad this summer.
Arsenal see Guehi as an upgrade on Rob Holding.