London - England have called Richard Wigglesworth into their squad to replace the injured Ben Youngs ahead of Saturday's Six Nations clash against Wales.
Youngs sustained knee ligament damage in Sunday's 46-15 victory over Italy in Rome and is expected to miss England's Twickenham showdown with Wales and possibly the entire tournament.
The Leicester scrumhalf was missing from the 32-man squad that gathered at England's training base on Monday, with Saracens star Wigglesworth drafted in to provide cover for Danny Care, who is set to start against Wales.
"Saracens scrumhalf Richard Wigglesworth has been added to the squad following an injury to Ben Youngs, with Exeter Chiefs hooker Luke Cowan-Dickie also coming in," a statement on the English RFU website said.
"Wasps No 8 Nathan Hughes will come into camp this week to be assessed on when he is likely to be available to play during the championship."
Care came off the bench against Italy to equal Matt Dawson's record of 77 caps won in the number nine jersey.
"You never want to see a bad injury like that and I was gutted to see Ben in so much pain," Care said after the Italy game.
"First thing's first, he's a good mate as well as a competitor for the shirt. He's in pain and all our thoughts are with him.
"It would be great to get into the number nine shirt for the Wales game having had 70 minutes under my belt which is great because I love being out there with the boys."