Jan Oblak has identified one of the major reasons why Lionel Messi has to be considered the best player in the world.
On Tuesday evening, Messi scored his 644th Barcelona goal, breaking Pele's record with Santos for the most goals scored with a single club.
It is the latest in a long of records smashed by the Argentine, who has now won six Ballon d'Or trophies.
The praise flooded in for Messi after his latest accolade, even by opponent players like Oblak, who reckons one of the factors behind the Barca star's brilliance is his ability to assess the movement of goalkeepers.
"He watches my legs," Oblak told Sky Sports.
"If I make one step, he will see it and shoot to the other side. This is why he is the best. This is why he is so difficult. He does not show it but he is always looking. He is always watching you. His eyes are on the ball but he sees you.
"He sees everything, I think. It is strange. Sometimes you think you are controlling them, you are controlling him. But in a second, he changes the game, he scores a goal, and Barcelona win.
"Sometimes you do not see him. Maybe you are thinking it is not dangerous. And then he scores. This happened to us last season. You need to be 100 per cent concentrated.
"He is still the best player in the world."
Oblak often wonders how Messi manages to score some of the goals he does, especially against Atletico Madrid with him in goal!
"He has scored many goals against me. Too many!" the Slovenian added.
"But he is a great player, an amazing player, the best player. There are many times that he scores a goal and you have this feeling that you cannot understand how he has scored so easily.
"You are not even close. Sometimes it feels like he has just passed the ball into the goal, it is not even a shot."
Following Barcelona's exit from the Champions League after a humiliating loss against Bayern, Messi requested to leave the Blaugrana for the first time in his career.
He would eventually agree to stay at the Camp Nou, but speculation persists that he could still leave, with PSG looking the most likely destination at the moment.