Marcelo Bielsa admits his Leeds United players will be losing confidence in him after a fourth straight defeat in which they were booed for the first time at Elland Road.
There are now serious doubts about the Argentine's immediate future at the club with American Jesse Marsch the frontrunner to replace him should a change be made.
Leeds have conceded 20 times in their last five matches and have taken just one point from 18 to leave them in grave danger of relegation.
And, following their 4-0 defeat by Spurs, Bielsa said: 'Of course this situation is serious.