Despite Lafferty's inconsistent career at international level, O'Neill believes that the 27-year-old is currently in a rich vein of form.
"He has all the attributes you need in a good centre-forward," he told BBC Sport. "Kyle has been fantastic in the three games. He's facing international defenders who just can't handle him. He has ability, technique, pace and size."
Tuesday's win saw Northern Ireland claim a third consecutive victory in a qualifying campaign for the first time in their history.