Ashar was convicted of 13 specimen counts of rape by a jury at Manchester Minshull Street Crown Court.
He was also convicted at an earlier trial of two counts of trafficking a person into the UK for exploitation, two of furnishing false information to obtain a benefit and one of permitting furnishing of false information to obtain a benefit.
Solicitor General Oliver Heald has asked the Court of Appeal for permission to refer the case of Ilyas Ashar, who was jailed for 13 years in October for subjecting his victim to a life of "misery and degradation".
Ashar repeatedly raped a deaf and mute girl he trafficked into the UK to work as his domestic servant
While Ashar exploited his victim to satisfy his sexual desires, the girl was also used to steal more than £30,000 in benefits.
After careful consideration, the Solicitor General, Oliver Heald QC MP, has decided to ask the Court of Appeal for permission to refer the sentences of Ilyas and Tallat Ashar as possibly unduly lenient."