Swansea swooped to sign the deep-lying midfielder on a Bosman move, bumping his wages from the financially hit Spanish league but accepting less than what was on offer from the likes of West Brom who were snubbed in favour of a switch to South Wales.
And Canas said: "The progression in my sporting life is important. At Swansea I saw something different.
"In Swansea I saw a great opportunity in which I will continue to grow as a person and as a player.
"It's not that I was offered more or less money. The Premier League is different and my football can be beneficial, I want to experience new things, something I could not do by staying at Betis and I had to see other things so for my family and for my future took this decision.
"I will not deny that they have also made a financial effort and it's unfortunate I decided not to renew my contract (at Betis), but economically Betis I could not get to what I think I deserve, but I understand perfectly."