Ronald Koeman should start working on post Messi departure or exist so as put up and assemble a formidable Barca team that can compete at the top level with other top European clubs.
I think so too, Barcelona do not need to hold on to Messi, I felt they should have let him leave at the end of last season, it's clear they can't hold on to him for much longer, he has already given his all of Barca (good things prolly must come to an end), and it's time for them and him to move on; that way Barca can build their team, but this time without Messi in it, it'll take the team quite some time to handle Messi's departure, but the sooner they start, the better.
Having said that, in today's game Olympiakos takes on City, can Pep continue his amazing form in the group stages this season and seal qualification today, I feel it'll be an easy win for Manchester City, they are fumbling in the epl, but not in the CL.