Louis van Gaal says players will hallucinate if referees don't let them have water breaks

• Holland face Mexico in Fortaleza on Sunday
• Temperatures are forecast to be around 35 degrees
• Van Gaal is 'not happy' about the conditions but says Holland will cope

By IAN LADYMAN FOR THE DAILY MAIL

Published: 18:11 EST, 28 June 2014 | Updated: 18:11 EST, 28 June 2014

Holland coach Louis van Gaal has warned that players may hallucinate during Sunday’s World Cup last-16 game with Mexico if FIFA do not allow both teams the opportunity to take on water.

It is expected to be around 35 degrees when the teams take the field in Fortaleza at 1pm local time.

‘This is why we have trained so hard — so weather conditions won’t be the opponent for us,’ said Van Gaal.

Cooling off: The team stop for a drink in the scorching conditions they will face in Sunday's last-16 clash

Lining one up: Van Gaal getting stuck in with the ball at his feet

‘I will call a spade a spade if I am not happy, though. We are open about it and can prepare for it.

‘If we have to, we will take drinks and put bottles round the pitch. It is extremely important and that is why a dehydration element was included in training and friendlies.

‘Every player will become dehydrated. Some lose four litres during the game. That is four kilos.

‘They have to replenish otherwise they will start hallucinating. The players know this. We just hope that the water is ready and that the referee does his job in a sensible way.’

Both Holland and Mexico were forced to train elsewhere yesterday because FIFA deemed the pitch at Estadio Castelao unable to cope with two practice sessions and a match in two days.

Embrace: Louis van Gaal puts an arm around his captain Robin van Persie

‘The humidity is so high it will affect the match,’ added Van Gaal.

‘That is the reason we tried to get the players as fit as possible. It will affect Mexico, but they are more used to it.’