Six-time major winner Sir Nick Faldo says "everything is stacking up against" Tiger Woods in his attempt to return to golf following injury.
American Woods, who last competed in August last year, planned to play in this week's Safeway Open, but withdrew saying his game was "too vulnerable".
The 14-time major winner had back surgery in September and October 2015.
"It's going to be a hard grind to come back and compete against the best in the world," said Briton Faldo, 59.