Sickening moment Kellbrook's coach sips a glass of SWEAT while training for a grudge match against Amir Khan

KELL BROOK sat and watched his coach drink a glass of SWEAT in training as he prepares to fight Amir Khan.

The British rivals will finally join forces to fight this Saturday night.

Brook has been tirelessly working to reach 147 lbs, the weight that the bout has been scheduled at.

Sky Sports posted a video of Brook sweating profusely after he completed a session at the gym.

Dominic Ingle, his trainer, told him to wash his T-shirt in a glass.

Brook demonstrated how hard he had trained by showing off the sweat that came out of his top.

Ingle initially stated that he would sell the glass filled with sweat on eBay to a fan.

Brook then encouraged his coach to consume the disgusting liquid.

Khan vs Brook: ring time, undercard and TV channel information for huge fight night

To the surprise of his fighter, Ingle accepted the offer and drank the "drink".

As they responded to the amazing clip, social media users were stunned by the gesture.

One person said, "That is f***ing grim."

Another added, "Made my want to vomit." How do you drink someone's sweat out of a glass?

Brook and Khan have been friends for many years. However, they are now meeting at the end of their careers.

Khan, a former two-weight world champion, has lost five times during his career. Brook, an ex-welterweight champ has been defeated on three occasions.

Both men have been inactive since their fights with Terence Crawford, and they lost to Terence Crawford, a pound-for–pound star.