World Cup concerns for Colin Slade? Fears sizzling first-five may have serious injury

There is plenty of concern surrounding the extent of All Black Colin Slade's injury.

Slade injured his quad during the warm-up to the Crusaders loss to the Waratahs in Sydney on Saturday night.

Coach Todd Blackadder admits they should have decided not to have played him, as this may have resulted in a more long term injury.

However the All Black utility insisted that he wanted to play, the injury forced Slade off the field late in the first half.

The Crusaders are unsure of the exact injury and he's undergoing further assessments of what could potentially be a long term injury.

Also being assessed is fullback Israel Dagg who re-aggravated his calf injury and was ruled out of last weekend's match, it's also unclear how long this niggle could side-line him for.

This comes on a growing list of Crusaders players with Ryan Crotty, Sam Whitelock and Kieran Read all not considered for Friday night's battle with the Hurricanes due to head knocks, and front rower Joe Moody also has a foot injury.

Slade, Dagg and Crotty were all at training today in Christchurch seeking medical treatment.

The All Blacks already have Aaron Cruden side-lined long term with a knee reconstruction, while Beauden Barrett is also recovering from a leg injury.