Dear Scylla, thank you for your kind advice to the previous comments.
Here I would like to share my sister's situation. She got 10 years banned from UK last month for deception. She did not have any right to appeal and it was a work trip she really needed to join-so apparently she reapplied for the visa on fast track to meet the deadline with a cover letter mentioning about the mistake. But her application was refused as the immigration officer was not satisfied with the causes she mentioned.
Now my sister is totally heart broken and worried as she has been aiming to apply for Express Entry in Sep/Oct this year. Please dear, feel free to share your honest advice on this case. She will definitely mention about it on her application, but do you think she hardly has chances on Canada as she is banned from UK for misrepresenting document?