Rugby legend and fundraising extraordinaire Kevin Sinfield has announced his latest challenge as he sets out to run seven ultra-marathons in seven days.

The Oldhamer made the announcement of his latest challenge on BBC Breakfast this morning, alongside his former teammate and close friend Rob Burrow and his wife, Lindsey.

Sinfield said he is taking on the challenge to raise money for motor neurone disease (MND) charities after seeing his friend Burrow affected by the illness.

The former Leeds Rhino player has undertaken several other physical challenges over the last few years, raising £13m in doing so, and this challenge looks set to be his toughest yet.

Sinfield, who has gained the nickname 'Sir Kev', will run 27.2 miles on seven successive days around the United Kingdom and Ireland.

He will start in Leeds on December 1, before heading to Cardiff, Birmingham, Edinburgh, Dublin and Brighton before finishing in London.

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Sinfield said on BBC Breakfast: “We go again, we start three weeks on Friday, running has been a great vehicle for us.

“We are really looking forward to it, there are 100 reasons we shouldn’t go again, but there are 5,000 why we should and the big reason is Rob.

The Oldham Times: Kevin Sinfield has raised £13m through his challengesKevin Sinfield has raised £13m through his challenges (Image: BBC)

“If we want to make a dent on MND and to shift the dial line we need money and the awareness has been brilliant over the last four years."

Burrow, who is able to speak using special equipment, told his friend: “Another crazy challenge, we thought you would stop after the last one, but here you go again. I would do the same for you.

“I hope to see you off at the start and be there at the finish, you never stop banging the drum for the MND community, remember Kev you aren’t getting any younger.”

The Oldham Times: Sinfield made the announcement alongside his former teammate Rob Burrow, left, and Burrow's wife LindseySinfield made the announcement alongside his former teammate Rob Burrow, left, and Burrow's wife Lindsey (Image: BBC)

Along with the announcement of Sinfield's new challenge, both himself and Burrow are releasing a book tomorrow (Thursday, November 9), which celebrates the friendship of the rugby legends.

The book, which is titled With You Every Step, looks to inspire readers to be there for those they love and explores the values of friendship.

For each copy sold, publisher Macmillan Children's Books will donate 50p to be split equally between the Motor Neurone Disease Association and the Leeds Hospital Charity.