Arsenal hero Ray Parlour is convinced Wojciech Szczesny will be sold.
The Pole has lost his place in the side to Colombian David Ospina, 26, who joined from Nice after last summer's World Cup.
Parlour, 42, told the Daily Star Sunday: "I think Casillas would be a really good signing for Arsenal because of the wealth of experience he has from his time at Madrid.
"I don't think Chelsea will let Petr Cech join them but I expect Szczesny to leave.
"I think Ospina will probably continue as second choice behind Casillas, should he come in."