Newcastle have agreed a deal to sign defender Chancel Mbemba from Anderlecht that hinges on a work permit being granted.
The 20-year-old DR Congo international completed his medical in Newcastle and agreed personal terms with the Barclays Premier League club.
Mbemba still needs to obtain a visa to complete the deal.
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A statement on Newcastle's official website said: " Following an agreement between Newcastle United and Anderlecht for the transfer of Chancel Mbemba, the player has been in Newcastle and has agreed personal terms with the club and undergone his medical.
"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 (22nd July).
"Unfortunately, the FA are unable to consider the club's application until Thursday of next week (30th July). The FA advised the club they were not able to convene a panel any sooner."
Mbemba is set to join new Magpies signings Georginio Wijnaldum, who arrived from PSV Eindhoven, and former Anderlecht team-mate Aleksandar Mitrovic at St James' Park this coming season.