Leeds boss Marcelo Bielsa admits defeat at home to Manchester United has them too close to the dropzone.
The 4-2 loss leaves Leeds five points away from the bottom three.
Bielsa said, "In the first half we started well and ended well but didn't manage to score. In the moments we lost dominance they scored.
"After we got back level we had the chance to go 3-2 up and straight way they went up and scored again. We played better trying to get back into the game than when we were trying to keep a result but something has repeated that is difficult to resolve.
"We have to defend better. We are missing Kalvin Phillips and Robin Koch was substituted and we could not count on Pascal [Struijk] in midfield because he went back into defence. Not being able to come with the three defensive midfielders we have, there is a weakness in the recovery of the ball."
On Leeds' league position, he added: "It is impossible not to be worried. We have conceded 50 goals. Do you think I cannot be worried? How can I not feel responsible?."
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