According to an exclusive report by GhanaSoccerNet, the teenage sensation will join the Merseyside club in a deal worth around 1.5 million pounds.
The 17-year-old signed a five-year contract with the Reds on Saturday night to complete the Europe move for the highly sought-after player.
Issahaku won the best player at the African U-20 Cup of Nations in Mauritania earlier this year.
He earned his first call-up for the Africa Cup of Nations qualifying matches against South Africa and Sao Tome and Principe in March.
The highly rated teen has also been named in a 30-man squad for Ghana's upcoming friendly fixtures against Morocco and Cote d'Ivoire next month.