The World Federation One Stop Fiqh

Ruling 946

If a person forgets to perform rukūʿ and sits down [for sajdah] after Sūrat al-Ḥamd and the other surah and then remembers that he has not performed rukūʿ, he must stand up and then perform rukūʿ. If he does not stand up but instead performs rukūʿ while bending forward [as he gets up], it will not be sufficient as he will not have performed the standing that is connected to the rukūʿ.