Britain's most decorated Olympian has swapped his bike for a boat and is set to launch his competitive rowing career next month.

Sir Bradley Wiggins, 37, will compete at the British Rowing Indoor Championships on December 9.

The Championships will be held at the scene of some of Wiggins' greatest achievements — London's Olympic velodrome.

"On Saturday, December 9, Sir Bradley Wiggins, five-time Olympic champion, will take on the best of the GB Rowing Team at the British Rowing Indoor Championships," British Rowing said.

Speaking earlier this year, Wiggins said: "I took up rowing when I retired just to keep fit, but my numbers started getting quite good, so I've started taking it up professionally now and getting coached seven days a week."

Wiggins is not the first person to switch between the two sports. Six-time Olympic gold medalist Sir Chris Hoy was a junior rower for Scotland before he became a professional cyclist while Rebecca Romero won Olynpic medals for Great Britain in rowing (2004) and then cycling (2008).

(Image: xxxxxx/Instagram)

Wiggins, who retired from cycling last year, discovered this week that he would not face charges from UK Anti-Doping's 14-month investigation into the Jiffy bag delivered to him and Team Sky at the 2011 Critérium du Dauphiné.

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As UKAD has been unable to prove what was in that package it said no anti-doping charges would be brought.

In a statement posted on his social media pages, Wiggins welcomed Wednesday's announcement.

The first British rider to win the Tour de France in 2012, Wiggins wrote that being accused of doping "is the worst possible thing for any professional sportsperson, especially when it is without any solid factual basis and you know the allegation to be categorically untrue".

He explained he had kept his counsel during the investigation "so as not to undermine it", but this was difficult with "widespread and unfounded speculation in the press", journalists on his doorstep and ill-informed comments directed at him from within the sport.

"This period of time has been a living hell for me and my family...at times it has felt nothing less than a malicious witch hunt," he wrote.

"To say I am disappointed by some of the comments made by UKAD is an understatement. No evidence exists to prove a case against me and in all other circumstances this would be an unqualified finding of innocence."

Claiming that the time taken to reach this conclusion "has caused serious personal damage", he then posed several questions for UKAD, including who was the source of the allegation and how much the investigation cost.

Wiggins, who retired from cycling after winning a fifth Olympic gold in Rio last summer, ended his statement by asking for privacy while he assesses his "legal options".

Earlier on Wednesday, UKAD issued a statement to say it was closing its investigation into what was delivered to Dr Freeman, and administered to Wiggins, more than six years ago.

The investigation opened in September 2016 and it later became clear the main allegation was that the package contained a banned corticosteroid, triamcinolone, while Dr Freeman and Wiggins said it was a legal decongestant called Fluimucil.

(Image: AFP)

The decision to investigate came soon after Russian hackers the Fancy Bears revealed that Wiggins had medical exemptions to use triamcinolone before the 2011 and 2012 Tours de France and 2013 Giro d'Italia.

Initially, Wiggins' then boss, Team Sky principal Sir Dave Brailsford, claimed the package could not have been delivered to the race, but he later told a select committee that Dr Freeman said he had asked for Fluimucil to be hand-couriered to France from British Cycling's Manchester base in order to treat Wiggins' allergies.

Unfortunately, there is no paperwork to confirm this and Dr Freeman, who has been too unwell to speak to UKAD and has recently resigned from his British Cycling post, lost his records when his laptop was stolen.

UKAD chief executive Nicole Sapstead said: "Our investigation was hampered by a lack of accurate medical records being available at British Cycling. This is a serious concern."