Hazrat Saeed bin Jubair (may Allah have mercy on him) said: If a man performs li'an with his wife and then, during the waiting period ('iddah), admits himself to be a liar, the hadd (punishment) will be applied and marriage can take place. But if the waiting period passes, then marriage will not be permissible.
Hadith Referenceسنن سعید بن منصور / كتاب الطلاق / 2763