Andres Iniesta has hailed Juan Roman Riquelme as "one of the best" talents in football.
"It is always sad when a world-class player such as Riquelme is no longer in the pitch," said Iniesta.
"If he decides to retire, football has lost one of the best. When I played with him and when I've seen him play what I liked most was the class that he had with the ball, the passes he made, the combinations.
"He is a player with whom I identify, in the sense that he gives the football and asks for the ball at all times."
The 34-year-old was part of the Villarreal side that reached the Champions League semi-final in 2006.