Dutch fitness coach Raymond Verheijen has blasted Louis Van Gaal after Robin van Persie suffered a groin strain in the side's friendly with Wales.
As reported by The Daily Mail, Verheijen - who previously slammed former Manchester United manager David Moyes over his handling of Van Persie - has insisted that national teams shouldn't be training twice a day ahead of the up coming World Cup.
The coach previously accused Moyes of overtraining the Dutch skipper, and now he's moved on to the new Manchester United boss.
Writing on Twitter, he said: "Holland looked tired & slow last night vs Wales. As expected, muscle injuries start to accumulate after weeks of intensive & double sessions.
"Fit but tired players who have to train intensively twice a day will accumulate even more fatigue. Injury risk will increase dramatically.
"Why are these NT (national team) coaches pushing their players so hard after a long season?"
Van Persie is, however, expected to be fit for the tournament and could still play a key role in Brazil. Van Gaal will be desperate for his skipper to prove his fitness ahead of his side's crunch World Cup opener against current holders Spain.
After the World Cup, the Dutch coach will then take up his role as boss of Manchester United and continue to work alongside Van Persie at Old Trafford. Manchester United fans will be hoping the forward returns to pre-season fit and full of confidence after the tournament.