Crackerjack Chiefs fullback Damian McKenzie looms as the clear and present attacking danger the Sharks have to quell when the two sides meet this morning in New Plymouth.McKenzie's all-round impact from his running, try-scoring ability and his goalkicking have been such that Aaron Cruden's presence at flyhalf is being questioned.The 21-year-old from Invercargill is a flyhalf by trade, but Cruden's seniority sees the youngster being pressed into service in the No15 jersey.The Sharks' defensive steel is second to none, but Dave Rennie's team has the personnel, patience and the skill to test the visitors' resolve.Despite a win and loss on their three-match tour so far, the Sharks' defence kept the Highlanders and the Blues at bay.Of the New Zealand sides, the Chiefs are probably the best attacking unit despite their flaky scrum.The Sharks will be without the injured Cobus Reinach and Philip van der Walt, who have returned home with knee and neck injuries.The experienced Michael Claassens has seamlessly replaced Reinach when it has been required, but his street smarts will be needed to look out for a rapid-firing Chiefs backline.Claassens acknowledged that McKenzie is the biggest threat, but the Lions' 36-32 early-season win against Chiefs will serve as inspiration for them."We try to pay attention to everything and that includes attack and defence. Our defence has been very solid this season, plus our kicking game has improved with each game."In the past two weeks, we've put a lot of focus into our attacking game. It has showed with each game that when we attack, we play a bit better. We'll still need to step it up from an attacking perspective," Claassens said."Lessons are learnt from every game, but the Lions play a very similar game to the Chiefs and they are not scared of throwing the ball around. As early as that game may have been in the season, we learnt lessons from that game."..