Manchester United may have to wait until the beginning of next week to confirm the signing of Chelsea's Juan Mata.
The Daily Mirror claim Mata's proposed move to Stamford Bridge has been put on hold as Chelsea and Manchester United are still discussing the structure of the deal.
Manchester United have reportedly agreed a £37million deal to sign Mata - but the Red Devils are yet to discuss when payments will be transferred between the two sides.
Chelsea manager Jose Mourinho confirmed earlier today that Mata was given permission to undergo a medical with the Premier League champions.
However reports claim Manchester United want to iron out terms with Chelsea before Mata undertakes the relevant medical tests before they make the Spanish playmaker their record transfer signing.
Manchester United are said to be relaxed about the situation - but are desperate for Mata to be signed in time to play Cardiff City on Tuesday.