Koeman says he feels badly treated over the past few weeks as Barcelona's title bid collapsed.
"I feel a little bit (mistreated) in the last two weeks," said the coach in a news conference on Saturday. "If you analyse a season, you must analyse the changes to the team, the young players, that we won the cup, that we had 13 points [less than Atletico] in December and we're still fighting for the league, even though it's a small possibility.
"That's what you need to analyse. And if I heard the media in the last few days, it looks like we did a really bad job and I don't agree.
"I feel supported by the players and the team has a big future. If we can sign what we think we lack to take the next step, I think we can be very excited about the team next season."