England prop Corbisiero to have knee surgery

Rugby Union - England Press Conference - Pennyhill Park, Bagshot, Surrey - 30/6/15 England's Alex Corbisiero speaks to the media Action Images via Reuters / Andrew Boyers

LONDON (Reuters) - England and Northampton prop Alex Corbisiero will undergo knee surgery on Tuesday and is doubtful for the Six Nations tournament starting in February.

"Six Nations is a very long way off for him, I think his focus is on getting himself fit and back in the Northampton squad," Northampton's director of rugby Jim Mallinder told reporters on Saturday.