Ryan Garcia is refusing to let news of his failed drug tests bring him down after enjoying a night out in Las Vegas with a mystery woman on Friday night.

Boxing journalist Dan Rafael broke the news of Garcia's failed tests earlier this week, with banned substance Ostarine found in his system the day before and the day of his April 20 victory over Devin Haney.

It has cast a major shadow over a win that went down as the greatest of the 25-year-old's career to date, after he floored WBC super-lightweight champion Haney three times on his way to a majority-decision triumph.

Garcia, who did not win the title after coming in three-and-a-half pounds over the super-lightweight limit, has been protesting his innocence over the past four days while insisting he never knowingly took performance-enhancing drugs.

And after requesting a B-sample test, the boxing star headed to Las Vegas this weekend for his former stablemate Canelo Alvarez's bout against Jaime Mungia.

Before the fight on Saturday evening, Garcia hit up Vegas' famous strip on Friday for a night out at Zouk Nightclub.

He could be seen walking to the club at Resorts World Casino hand-in-hand with a mystery brunette, who appeared to be the same woman he bought a $1.5million engagement ring for last month.

The identity of this new love interest still isn’t clear, yet in a recent post that has since been deleted, Garcia could be seen discussing the price of the ring with a sales clerk, who informs him it was '$1.5 million.'

In the lead-up to his win over Haney, the troubled fighter also proposed to Australian porn star Savannah Bond, before heading out on a date with model and TikTok star Grace Boor after the fight.

In footage shared by the club on Instagram, Garcia can first be seen taking a swig of water while in a VIP section in Zouk on Friday night.

He then went up on stage to perform his new song, 'Blessed', alongside members of his entourage before rapper Ludacris came out for the main event of the evening.

Garcia reportedly tested positive for Ostarine in two urine sample tests taken the day before his clash with Haney and also following the fight.

Ostarine, the trademarked name for a Selective Androgen Receptor Modulator, attaches to proteins in the body known as androgen receptors and helps to grow muscles.

Due to its ability to grow muscle, it is sometimes found in dietary supplements, particularly bodybuilding supplements, despite not being approved.

Garcia has drawn heavy criticism in the wake of his failed tests, including from UFC legend Conor McGregor.

McGregor told him to 'get your head together or kill yourself' in a chilling message on social media, before Garcia responded by calling for a 'bare knuckle' fight with the Irishman.