Swansea signing Jose Cana fed up with Real Betis fans
Canas has been a target of anger from fans who claim his form has dipped since the switch was revealed in January.
Canas' agent Alvaro Torres said: "Jose has done very well this season, even though he is leaving.
"He wanted the club to receive money for him but that was not possible.
"Jose has given Real Betis everything but maybe the fans don't understand that."