Ahead of the clash, Brook has been putting in the work in the gym with trainer Dominic Ingle.
Brook returned to work with Ingle having previously split from him ahead of his fight against Terence Crawford last November. A fight he went on to lose.
And ahead of Brook’s huge fight with Khan, Ingle has disgusted fans by drinking the 35-year-old’s sweat.
The video, which was posted by Sky Sports, shows the trainer trying to motivate Brook after an intense training session.
Ingle tells the Sheffield boxer: “On the 19th, you are going to get the blood and the tears from Khan, you can give me the sweat instead. Am I alright to put this on eBay?”
Brook laughs in reaction to his trainer’s query, jokingly telling him to down it. And Ingle does just that as he chugs the former IBF welterweight champion’s sweat.
The video has been met with backlash from many on Twitter, with one individual deeming it borderline cannibalism.
Nevertheless, Brook will be hoping Ingle’s coaching, albeit as odd as it occurs, pays dividends when he looks to defeat his long-time rival Khan on Saturday night.
Brook and Khan have a storied past, with there being bad blood between the two Brits which has seen them being linked with potential bouts in the past.
But, in what is expected to be the last outings for both fighters in the sport, they will put an end to their boxing careers and their long-time rivalry.
Brook goes into the bout as favourite, but Khan has played the role of the underdog in the past, none more so than in his fight with Marcos Maidana in December 2010, with the King winning the contest on points.
Brook vs Khan promises to be a tantalising affair, but let’s just hope Ingle isn’t at ringside with a glass in hand.