Speaking to Voetbal International, Ronald Koeman said: "Messi disguised everything.
“He was very good and he was winning. Of course, he had good players around him, but he made a difference.
"Thanks to him, everything looked better. This is not a criticism, but an observation.”
Koeman also commented on Barcelona's financial situation.
"I knew it wasn’t good, but not that it was so bad. The new president, Joan Laporta, did not know that either. He was as surprised as I was.”
Koeman spoke to the Dutch media outfit in the aftermath of Barca's 3-0 defeat against Bayern Munich.
However, during his press conference for the league clash against Cadiz, Koeman refused to take questions from the media, instead, he read a statement.