That's why we have other players as well. As I said, we should move away from relying on Pirlo in every game as we're doing currently, but that's no reason not to extend his contract. While we should continue to improve our squad for the CL, being able to rest key players in the league without hindering ourselves is important, and that's what Pirlo offers. Plus, Pirlo can work his magic in parts of the group stages and possibly even deeper in the competition, depending on the opposition(e.g. Celtic last year).