Depends on the reasoning for it being shy. Is the dog just naturally shy tho every attempt has been made to socialize and work with the dog? If the dog is shy due to environment and raising then yes, but only if it has no aggression or shyness aggression issues.
If the dog has just always been that way Then normally I would say no however is it is a good worker then yes.
My thing about shy dogs is they don't usually do as well in sports but if the dogs shyness doesn't effect that and it has no aggression issues and doesn't come from a history of dogs with shyness issues I wouldn't see a problem with it .
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