Roger Federer can return from six months out and win another Grand Slam, says his former coach Paul Annacone.
The 35-year-old, who has won 17 majors, is due to make his comeback from a knee injury against Britain's Dan Evans in the Hopman Cup in Perth on Monday.
Annacone, who coached the Swiss from 2010 to 2013, told BBC Sport: "Last year was a very tough year for him and he still got to the semis of Wimbledon.
"There is no reason why he can't play at that level again."
Annacone believes Federer's best chance of another major title will come at SW19, where he has triumphed seven times.