England manager Gareth Southate has revealed Premier League clubs are withholding data from the national team.
The Football Association completed a deal with clubs to share data during Euro2016, but it seems not all of the clubs have complied.
"We share our data," Southgate said. "We don't always receive data. So that's where we would like to head towards, because it helps work out a training schedule when they first come into camp.
"But we can't enforce it. It's got to be an agreement, and at the moment some clubs are more comfortable with it than others."
Some of the issues surrounding data are the possibility of leaks to rival Premier League clubs.
Many of Southgate's backroom staff currently are – or have recently were – involved at clubs, for example, Steve Holland, who recently left Chelsea and Crystal Palace goalkeeping coach Martyn Margetson.
Instead, United have failed to supply the national team with the results of the 'Omegawave' software that they currently use to track performance in training.