Salary demands requested by Adrien Rabiot and his mother, who is also his agent, could see Manchester United's move for the Juventus midfielder collapse.
The Red Devils have agreed a £15.2million transfer fee for Rabiot, with Juve happy to let him leave.
However, according to Sportmediaset, the deal cannot be completed until the personal terms are finalised.
Veronique Rabiot will have direct contact with United, by Friday but is asking for a salary higher than £6million that her son is currently earning in Turin.
Juventus fans are excited by the possibility of Rabiot departing and hope that the deal can be concluded as soon as possible.