The Bluebirds have enjoyed a strong campaign and are still well in the mix to win automatic promotion to the Premier League.
However, Warnock feels their promotion hopes could be affected by what he has called ‘ridiculous’ organisation from the EFL.
Cardiff are due to face relegation-threatened Burton Albion on the Friday following this month’s international break and Warnock claims it is unfair on his players.
‘I think we’re going to have to write to the Football League,’ he said. ‘No team going for promotion should play on a Friday coming back off the international break, it’s pathetic.
‘We’ve got lads playing on the Wednesday night and we’re playing Burton on the Friday night? It’s absolutely ridiculous.’
Newcastle have been linked with a shock move for former Sunderland goalkeeper Simon Mignolet during the summer.