Li Siyuan was able to enter Daliang quickly and then head toward Luoyang. Before he could reach there, though, Li Cunxu was killed in a mutiny at Luoyang itself. Li Siyuan entered Luoyang and took the title of regent, as he was apparently undecided at that time whether to support Li Cunxu's son Li Jiji the Prince of Wei, who was returning from an expedition that destroyed Later Tang's southwestern neighbor Former Shu. However, Li Siyuan subsequently became resolved to resist Li Jiji, and he sent Li Congke to Huguo Circuit (護國, headquartered in modern Yuncheng, Shanxi) and Shi Jingtang to Baoyi Circuit (保義, headquartered in modern Sanmenxia, Henan), to serve as their acting military governors and to defend against potential attacks by Li Jiji. Li Jiji's own army abandoned him, however, and he committed suicide, ending the possibility of a confrontation. Li Siyuan then took imperial title. Apparently shortly after, Li Congke was made the full military governor of Huguo. In 927, he received the honorary titles of acting "Taibao" () and chancellor (同中書門下平章事, "Tong Zhongshu Menxia Pingzhangshi"). He subsequently received the honorary titles of acting "Taifu" () and then acting "Taiwei" (). Early in Li Siyuan's reign, An Chonghui became chief of staff and was the most powerful official at court, such that even Li Congke's adoptive brothers Li Congrong and Li Conghou had to honor him. An, still begrudging Li Congke over their long-ago confrontation, began to speak poorly of Li Congke to Li Siyuan, but Li Siyuan initially did nothing. In 930, An issued an order in Li Siyuan's name to Li Congke's guard commander Yang Yanwen (), ordering him to expel Li Congke. Yang found an opportunity when Li Congke went outside the city walls of Huguo's capital Hezhong Municipality () to examine cavalry troops, and locked the city gates, refusing Li Congke reentry. When Li Congke questioned him why he did so, Yang responded, "It is not that I, Yang Yanwen, wishes to turn away from the grace you showed me. It is that the Office of the Chancellor issued an order to ask you, Lord, to pay homage to the emperor."