He added: “[Playing on clay] will allow him to do a little land work, to get a bit of a physical shape.
“Wimbledon is hardly won anymore by serving-and-volleying, it is won from the baseline.
“If he also wants to win Wimbledon, he will necessarily have to beat Djokovic, Nadal or other players who are in the top 10.
“And to meet them [beforehand], he will have to play these players in the Masters 1000 on clay or at Roland Garros.”
