He said: “I find when you start a contract is you agree to commit for the length of the contract for the money you have signed for.
“But that is basically not the case because of you only retain the value of the player if you extend the contract two years before the end of a contract, or sometimes one year.
“Then you are always in a delicate situation because now do you sell with one year to go knowing you will get less money than when he has two years? So basically you have not much choice.”
Arsenal (4-2-3-1): Ospina; Bellerin, Koscielny, Mustafi, Gibbs; Cazorla, Coquelin; Oxlade-Chamberlain, Ozil, Iwobi; Sanchez
Ludogrets (4-2-3-1): Stoyanov; Minev, Moti, Palomino, Natanael; Dyakov, Anicet; Misidjan, Marcelinho, Wanderson; Cafu
Referee: Artur Dias (Portugal)
BT Sport 3, 7.45pm