L1 B extension thru Canada

I am from India, currently in US on L1-B VISA. My visa will expiry on OCT-2015 and I-94 on SEPT-2015. My employer is asking me to file for L1-B extension thru Canada. Wanted to know if my L1-B extension got rejected in Canada can I still come back to US (till my VISA valid) or my current VISA status will also get updated and will not be allowed to come back to US?

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