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Former world No 5 Fernando Gonzalez has questioned whether Roger Federer will be able to win a Grand Slam on his return from injury, amid rumours that the 40-year-old may retire following a clue he dropped at Wimbledon. The Swiss star has battled knee injuries and was forced to undergo three surgeries in 18 months, which has left him out of action since last year's SW19 tournament.

The 20-time Grand Slam champion has admitted that he would consider retirement when he is no longer able to compete at the top of the sport. "I am a winner but, if you're not competitive anymore, then it's better to stop," Federer told Dutch newspaper Algemeen Dagblad.

"I don't think I need the tennis. I am happy with the little things, like when my son does something right and when my daughter comes home with a good grade. Tennis is part of, but not my entire identity.

"I want to be and remain