Philippe Coutinho said it was hard to explain why Lionel Messi and Barcelona had not won the Champions League more often in recent seasons.
Messi, 31, is a four-time winner of Europe's premier club competition, but the last of those successes came in 2015.
"That's difficult to say. Messi is the best player in the world, perhaps the best in history and it's difficult to explain that," the attacker said ahead of Barca's clash against PSV on Tuesday.
"I guess there's no explanation to that. Such as all of us he is aiming so much to win big things and the Champions League is one of them."
After months of waiting, has his first shot at the Champions League with Barça. September 17, 2018
Barca host PSV in Group B, which also includes Premier League outfit Tottenham and Serie A giants Inter.
