England's Courtney Lawes ruled out of the rest of the Guinness Six Nations

Second-row Lawes was left prone in the second half of England's 21-13 defeat to Wales in Cardiff on Saturday and scans have revealed the full extent of his muscle strain.

"Courtney Lawes (Northampton Saints) will miss the rest of the Guinness Six Nations due to a calf strain sustained (on Saturday) in Cardiff," the RFU said in a statement.

"Following the results of his scan (on Sunday) afternoon, Lawes is expected to be out for a minimum of four weeks. He will return to his club for rehabilitation."

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