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The son of former South African rugby union star Joost van der Westhuizen has written a heartbreaking letter to his father asking him to "please tell God Liverpool must win" in heaven.

The legendary ex-Springboks scrum-half was diagnosed with motor neurone disease in 2011 and lost his battle with the illness earlier this month, passing away at his home on February 6.

And Van der Westhuizen's son, Jordan, has written a letter to his father, asking him to relay the message ahead of Jurgen Klopp's side's visit from Tottenham on Saturday.

The letter was shared on Twitter by former Reds goalkeeper Sander Westerveld, with the Dutchman tweeting: "Liverpool won, no surprise, thanks for asking your daddy, Jordan!

"RIP Joost van der Westhuizen".

In the letter, Jordan writes: "Dear Daddy thank you for everything but most of all for 'be the best you can be!'

(Image: (Photo by David Rogers/Getty Images))

"You are the best rugby player in the world I want to be the best sportsman like you, because you said I must work hard!!

"I will always [love] you to the moon and back. Daddy please tell God that Liverpool must win.

"You will never walk alone!

"I love you so much Jordan xxx"

Van der Westhuizen, who played 89 times for the Springboks, was honoured at a public memorial service in Pretoria on Friday.