England prop Andrew Sheridan has been ruled out of the remainder of the Six Nations after tearing a calf muscle in last weekend's victory over France, team manager Martin Johnson confirmed on Tuesday.

Giant loosehead Sheridan limped off midway through the first half of Saturday's match at Twickenham to be replaced by youngster Alex Corbisiero.

A scan subsequently revealed Sheridan had torn a calf muscle, Johnson said.

"Sheridan has a grade two tear, so it is not good. I think he is probably out of the championship. I am hearing it is two to four weeks," Johnson said.

"He is probably out of the championship unless there is some huge improvement very quickly."

The injury deals a blow to England's hopes of winning their first Grand Slam in eight years. Johnson's unbeaten side face Scotland at home on March 13 before travelling to Dublin to face Ireland the following week.

The injury is also bitterly disappointing for Sheridan, 31, who returned to international rugby last autumn after a long absence due to a shoulder injury.

Johnson meanwhile had more positive news on fly-half Toby Flood, who was replaced early in the second half against France.

"Flood is okay. He has a bit of Achilles tendon soreness. We think he will be fine (to play Scotland) but we will be very cautious with him this week," Johnson said.

With Flood unlikely to train with the squad until Thursday, England may choose to keep Jonny Wilkinson in camp rather than release him back to French club Toulon this weekend.

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