The former Real Madrid shot-stopper is arguably one of the greatest players in the club’s history. Having been with Los Blancos since the age of nine, Casillas represented the club on 725 occasions, winning 19 titles in the process. Now at Porto, the ‘keeper is free to leave the club as they are worried his wages will land them a Financial Fair Play penalty. Even at 36, he could do a job between the sticks for most clubs.
Player power has grown so much that clubs are practically being held to ransom by superstars nearing the end of their contract, like Alexis Sanchez with Arsenal.
There are serial winners scattered all over Europe available for nothing more than a signing-on fee and a slightly inflated wage packet.
So who could your club bring in for free this summer?
talkSPORT has assembled a staring XI made up entirely of players who are available for nothing from July.
Click on the right arrow, above, to see the squad and how they line up in a 4-2-3-1 formation.