Real Madrid midfielder Esteban Granero is convinced there's plenty of improvement in the title winners.
Granero, who has been subject of a bid from Liverpool this summer, is happy at the Spanish Liga champions.
He said: "We have many challenges at a collective level; the main challenge for the team is to do better than last year, which was a very good season; and my main challenge is to continue growing and to establish myself in the team."
Referring to the potential of Real Madrid he also said: "Real Madrid will be the team to beat for many years."