Wales coach Wayne Pivac has decided to keep Liam Williams in camp ahead of next week's Six Nations clash with England, rather than release him for game time with the Scarlets.

Pundits, including the highly respected Sean Holley , are calling for Williams to come into Pivac's team for the battle with the old enemy at Twickenham, although it was on the basis of him getting 80 minutes of rugby under his belt.

Williams has not played since the World Cup quarter-final win over France in mid-October, having injured his ankle in training ahead of the semi-final with South Africa.

However, rather than release him to play for the Scarlets against Munster on Saturday, Wales have chosen to monitor Williams themselves.

It is unclear whether Williams would have been 100 per cent ready for the Scarlets this weekend, although his fitness is said to be good for the England game on Saturday week.

However, if selected by Pivac he would obviously go into Twickenham battle lacking match sharpness.

Wales have released four players back to the regions. Seb Davies and Hallam Amos play for Cardiff Blues away to Edinburgh on Friday night in the PRO14.

Amos is selected at full-back and may also come into the selection mix for England, with Josh Adams out and doubts about the fitness of George North following the head injury sustained during the defeat to Ireland.

Amos has had two matches back following an ankle problem and looked sharp at 15 in last weekend's victory over Benetton.

Aaron Shingler has been released for the Scarlets' game in Munster, with fellow flanker Taine Basham freed up for the Dragons' home clash with the Cheetahs.

The Ospreys players are being retained by Wales as their game in Italy against Treviso has been called off.