L1B extension from mexico after Visa got expired

Hi.I am currently on L1B.My visa got expired on Sep2013 but I have valid visa until Sep 2016.I need to go to India in December so my compnay has filed an extension for me and asked me to go to Mexico.Is it really safe to go for an extension now since my I94 is valid until 2016 September.Can someone please help me here?

I think stamping in Canada is a better option than Mexico