Rory McIlroy could find himself in trouble following an incident on the opening day of the BMW PGA Championship at Wentworth.
A bogey on the 12th caused McIlroy to throw his club away in frustration on what was a difficult day for the world number one.
Tournament director David Garland said in a statement: "I have not yet had the chance to view the incident, but I will be requesting a tape.
"If any breach of the Tour's guidelines on course etiquette is found, then appropriate action will be taken in due course.
"But any decision is unlikely to be taken until after the tournament has finished."
McIlroy finished the first round on two-over-par following five bogeys and a double-bogey.
