Paraguay goalkeeper Justo Villar's World Cup is over after he tore a calf muscle in the opening minutes of Saturday's Group B defeat to England.

The 28-year-old has been told he will not play again for at least a month.

Paraguay team doctor Osvaldo Pangrazio said on Monday the latest scan "shows a very serious tear".

"It's a five-centimetre tear, with a hematoma of more than 10 centimetres. It's a serious injury," he added.

Jorge Nunez, who came on as a substitute for Villar against England is set to keep his place in the side for Thursday's game against Sweden.

Villar was voted Paraguayan Player of the Year in 2004 and was back-up keeper four years ago in South Korea and Japan when he was still playing for Paraguayan side Libertad.

He is currently with Argentinian side Newells Old Boys.