Real Madrid goalkeeper Iker Casillas has offered congratulations to Treble winners Barcelona - but with a warning.

The Spain international said: "I must congratulate Barcelona because it was the best and deserved to win all three titles.

"But I must warn them that next season Real Madrid will be playing very well and we will try to unseat them.

"I can show healthy rivalry because we didn't have a good season and our nearest rivals did. I offer my admiration and congratulations to Barcelona."