extensively in the World Cup due to Miles Robinson's injury, and he had that awful PK foul on Gareth Bale against Wales that allowed them to tie up the game. I like Zimmerman in the air a target on corners and free kicks, but not as a top notch center back.
I'll admit that I haven't seen as much of McKenzie as i would like to know his strengths/weaknesses, but he seems intriguing to me.