Under-fire Vijay Singh is due to partner Lee Westwood in the AT&T Pebble Beach Pro-am in California this week.
Last Thursday, the former world number one pulled out of the Phoenix Open hours before he was due to tee off citing a back injury.
It came just a day after admitting he had been using a deer antler spray previously found to contain a prohibited growth hormone.
His withdrawal had some people wondering if he had been suspended from the PGA Tour over the incident, but after practising for this week's event he was reported to be involved in talks with Tour commissioner Tim Finchem on Wednesday.
When the Fijian finished his Tuesday session on the driving range, a journalist tried to speak to him but Singh refused to comment.
Singh, who turns 50 later this month but is still inside the game's top 100, admits having used the spray, but has stated he did not know its link to the prohibited substance IGF-1.
"At no time was I aware," he said in a statement. "I am absolutely shocked ... and am angry that I have put myself in this position.
"I have been in contact with the PGA Tour and an co-operating filly with their review of this matter."
The Tour carries out drug-testing but does not take blood, and that is thought to be the only way to detect the banned IGF-1 hormone.
Westwood, now back as a member of the PGA Tour and living in Florida, has flown from Dubai - a 12-hour time difference - for his first appearance in the event since 2005.
England's world number eight, who finished joint fifth at the Omega Desert Classic, teams up with his father John in the pro-am competition, which last year saw Padraig Harrington and Irish racehorse owner JP McManus share the title.