"We've had an internal inquiry, Darron apologised first thing Monday morning, sent a lot of other apologies around to the relevant people and apologised to others," Grayson told reporters.
"It is not a situation you encourage for any player to be drinking before a game but that is down to their responsibility
"I can't be with them 24/7 and ultimately, it's going to cost him a lot of money and his reputation is in tatters to a certain degree."
Sunderland, who were relegated from the Premier League last season, begin their 2017-18 campaign with a home game against Derby County on Friday.
(Reporting by Hardik Vyas in Bengaluru)
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