Cohen, scrum-half Matt Dawson and back row forward Chris Jones all sat out training as a precautionary measure.

Cohen, one of only nine players to keep his place following the 36-3 defeat against the All Blacks in Dunedin last Saturday, has a minor soft tissue injury to his upper leg, with Dawson (groin) and Jones (hip) also diagnosed with minor ailments.

Dawson is due to be on the bench as cover for scrum-half Andy Gomarsall but Jones has missed out on a place in the 22.

All Blacks wing Doug Howlett is likely to be out of action for up to a month.

Howlett suffered a shoulder injury during the win over England and has now been ruled out of the second Test.

A scan has revealed muscle and ligament damage around the joint meaning Howlett is unlikely to feature for the All Blacks until they kick-off the Tri-Nations series with a match against Australia in Wellington on July 17.

Coach Graham Henry is also still unsure whether or not Richie McCaw will be taking the field against England.

McCaw has yet to resume training after suffering a blow to the head in last weekend's Test at Carisbrook and although he has passed the psychometric tests he is still experiencing headaches.

A decision on his inclusion could be left as late as Saturday morning.

Henry is determined New Zealand will not take victory over England for granted.

"England will play out of their skin, they've got no option. They'll be right up there and they will play well. Unless we're right upstairs, we're in trouble," said the former Wales and British Lions coach.

"I think attitude's going to be the key on Saturday, if it's not right, we're going to get second."