Amir Khan grins as he secretly watches Kell Brook's open workout ahead of Saturday's grudge match

AMIR KHAN appeared to find something funny as he grinned his way through Kell Brook's open workout.

The two Brits will finally clash on Saturday in Manchester after a decade of trash-talking.

Khan took a spot above a ring in the Trafford Centre in the north-west City as Brook showed off his skills.

And the 35-year-old Bolton man was in high spirits and smiled as his old adversary did some sparring.

Brook was booed as he made his way into the ring, but looked nimble on his feet as he trained with Dominic Ingle.

The grudge fight has been beautifully set-up over the last few weeks – but things took a somewhat sickening turn recently.

Footage shared on social media showed Brook, 35, watching on as coach Ingle drank a glass of his SWEAT during a training session.

Brook has been working away tirelessly as he looks to make 147lbs – the weight the bout has been set at.

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In a clip posted by Sky Sports, Brook was sweating profusely as he finished a session in the gym.

His trainer Dominic Ingle told him to rinse out his T-shirt into a glass.

And the amount of sweat which came out of the top was quite remarkable as Brook showed off how hard he has been training.

Initially, Ingle said he was going to put the sweat-filled glass on eBay for a fan to buy.

But Brook then urged his coach to drink the disgusting liquid.

And Ingle obliged as he downed the 'drink', much to the shock of his fighter.

Fans on social media were gobsmacked by the gesture as they reacted to the incredible clip.

One said: "That is f***ing grim."

While another added: "Made me want to vomit. How you drinking someone's sweat from a glass?"

🥊Khan vs Brook – ring walk time, undercard, TV channel and live stream info for HUGE fight night

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