Tour de France: Andy Schleck injury forces him to pull out

Former champion Andy Schleck has pulled out of the Tour de France with a knee injury.

Schleck, who won the 2010 Tour  after Spain's Alberto Contador was stripped of the title for doping, crashed during Monday's third stage.

"The ligaments and meniscus in the right knee are too severely damaged," said his Trek Factory team.

Schleck tweeted:  "Very disappointed to let you know that I will not be able to start. This is a huge blow."

The 29-year-old, who will now travel to Switzerland for further medical tests, crashed in London close to Olympic Park, home of the 2012 Games.