Barca have had an inconsistent first season under their former captain.
Koeman said, "Any coach that comes to Barça has to win and make the people happy. You could have a good name, and have been here before as a player, but ultimately it's about the trophies and what you win. If you look at my coaching career, not just with Holland but at other places like Benfica, Valencia and Everton and Southampton in England, I wasn't at big enough clubs to expect to win everything.
"Now I need to win over the fans and I have noticed that these things are not done easily. I feel that decisions need to be made, changes need to be made. Young players need to get their chances and after a time there need to be assessments. A coach has to work hard and show that they are up to coaching at a club like this."