Barcelona president Sandro Rosell admits they need to open new contract talks with Lionel Messi.

Rosell says it's important they begin work immediately on tying Messi to a new agreement.

He said: "It finishes in 2016, but it would be irresponsible not improve his contract. You have to think about what could happen. Now there is nothing scheduled, but he is not a machine.

"We must start working now on his contract."