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Thanks Brendan for your reply. 
Changing the link to the TrackTest homepage would be an obvious choice but is not possible in this special case due to some other reasons.

hi guys,

just an idea- in our product- TrackTest.eu we have couple of authoritative websites linking directly to our Sign-up page.

Does it make sense to use rel=canonical on Sign-up page with pointing to the homepage so we will pass some link juice to homepage ?

I understand that it is not a use how was canonical designed (it is not duplicated content) and don't want to screw anything.

Thanks