Wales flanker Warburton ruled out of Six Nations

The 29-year-old British and Irish Lions captain, currently ruled out with a neck injury, is expected to be on the sidelines for four-six months.

(Reuters)

"In close consultation with the WRU and Cardiff Blues we decided it would be proactive to have surgery now on a knee injury and I'm looking forward to returning to action fully fit," Warburton said in a statement.

He has not played since the third Lions test in Auckland in July.

(Reporting by Hardik Vyas in Bengaluru, editing by Ed Osmond)