Ben Morgan insists England must use a mix of brain and brawn to subdue the South Africans at Twickenham on Saturday.

The Springboks have been called "the big green machine" by Mike Catt ahead of the second QBE International and Morgan insists England muscle alone will not underpin a first win of the autumn.

"South Africa are a big, physical team who like to use route one, so we have to use our smarts to move them around and create mismatches," the Gloucester No.8 said.

"We want to get South Africa running around the field chasing us. If we can do that and take our opportunities, we'll come out on top.

"If we carry into narrow channels then that's exactly what they'll want. They'll line us up from 10 metres away and come charging at us. But if we can shift the point of attack, it can make the world of difference."

Morgan is to continue as No.8 reinforcement to Billy Vunipola when Stuart Lancaster names his starting XV today. There are fitness concerns over Vunipola but he looks likely to profit from Lancaster wanting to give the same 23 another chance.

Semesa Rokoduguni is out with a thigh problem and Marland Yarde is in as wing cover, competing with Anthony Watson for the No.14 start. Flanker Tom Wood is an injury doubt and James Haskell is on standby as his replacement.