The 20-year-old defender, who has played for the Democratic Republic of Congo at senior level, has agreed personal terms with the Magpies having successfully passed his medical.
A statement on Newcastle’s official website confirmed they are now waiting for clearance on the player.
It reads: “The documentation in relation to the club’s application for a Governing Body Endorsement (GBE), required in order for Mbemba to obtain a visa, was submitted to the FA on Wednesday morning (July 22).
“Unfortunately, the FA are unable to consider the club’s application until Thursday of next week (July 30).
“The FA advised the club they were not able to convene a panel any sooner.
“The club will provide an update for supporters at the earliest opportunity following the conclusion of the panel hearing.”
A fee of £8m has been agreed between the two clubs leaving Mbemba close to becoming Steve McClaren’s third signing of the summer.
He will join Georginio Wijnaldum, who arrived from PSV Eindhoven, and former Anderlecht team-mate Aleksandar Mitrovic as new arrivals at St James’ Park.