Leeds clung on to their place in the top two despite a goalkeeping gaffe from Kiko Casilla as they battled to a 1-1 draw at Brentford.
Boss Marcelo Bielsa and United, top of the Championship and 11 points clear of third place just two months ago, have seen that lead evaporate over the last 10 matches.
In fact, Brentford would have gone above Bielsa's wobbling Whites with a victory over them, and looked well on the way after Casilla gifted Said Benrahma his ninth goal of the season. But Liam Cooper equalised to secure a valuable point for a side who had lost four of their previous five matches.
However, they will still find themselves outside the automatic promotion spots in 24 hours if Fulham pick up a win at Millwall.
Birmingham extended their unbeaten run to six games with a smash-and-grab 1-0 win at struggling Barnsley.
Irish striker Scott Hogan's second-half goal, set up by teenage sensation and star man Jude Bellingham, gave the visitors the three points at Oakwell.