Vision emerged last night of Ty Vickery suddenly collapsing during the Tigers' NAB Challenge match on Friday, after becoming confused and trying to mark the ball, despite him being no where near the footy.

Vickery was diagnosed with concussion, but the club says it has no idea what caused his sudden collapse.

Behind the goals vision captured the moment when Vickery threw his arms up in the arm as though he was marking a ball, before grabbing thin air and collapsing.

Watch the incident below:

https://www.youtube.com/watch?v=gNtbF4MgGDQ

But Rhett Bartlett believes he has found the reason for Vickey's sudden collapse.

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