Barcelona are reportedly interested in signing Manchester United youngster Arnau Puigmal in January. Puigmal, 19, is yet to make a first-team appearance for United since arriving from Spanish side Espanyol in 2017.
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The Argentine came off the bench to score twice in the 5-2 La Liga win over Real Betis on Saturday.
"When I arrived, they told me Messi was unhappy," Koeman told Sport.
"We spoke at his house. He explained his reasons and I was honest.
"I told him that the only things I could change were football things: the system of play, his position on the pitch, his importance in the team.
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"But the issues he had with the club, I could not change them.
"Messi demonstrated to me that he's a person that wants to win things, be the best and continue being the best, even though he's had his problems with the club."
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