"Middlesbrough looked safe as houses but all of a sudden people have caught them and they'll now be on edge," said Bruce after Wigan's stalemate at Manchester City.
"They would have thought that a win against Reading would have made them safe, but they lost and now other teams are rallying.
"I don't even want to think about Newcastle. Those that have been down there for months are used to the pressure.
"The teams that drop in at the last minute are not used to it. But history tells us that somebody always drops in."