The Barca captain is weighing up his future ahead of the summer market.
"He is a special player and the only one of his kind at Barcelona," he said.
"I have enjoyed playing with him since 2012 and he is a vital player for us, both in the national team and at Barcelona.
"He is having a magnificent season and we are better on the pitch with him.
"We must make sure he is healthy as he is vital to helping us win titles here and with Barcelona."