Paul Casey says Tiger Woods' withdrawal from the Safeway Open has "killed the vibe" in California.
After serving as a Ryder Cup vice-captain in the United States' success at Hazeltine, the 14-time major winner confirmed last week that he was set to return to the PGA Tour for the first time in 14 months in Napa.
However, just three days later, the 40-year-old said his game remained "vulnerable" as he continues to regain full fitness after three operations on his back and pulled out of the tournament, as well as November's Turkish Airlines Open.
World number 12 Casey is disappointed to see Woods' return held up once again, but hopes the former world number one can use the extra time to return to his best.
"I am a golf fan as well as being a player this week and I am saddened he is not here and I would love for him to be here," Casey told Sky Sports.
"You know it kind of kills the vibe but I want to see him playing great golf again and I hope he comes back very soon or comes back when he is ready.
"I don't know what else to say, it would be nice if he was here."