Changing managers late in the season is "strange" as new coaches do not have "magic dust" for struggling teams, says Crystal Palace boss Roy Hodgson.
On Wednesday, Sam Allardyce replaced Javi Gracia as Leeds manager for the final four games of the season.
He and Hodgson are two of six Premier League managers who will finish the season on an interim basis.
"I don't quite know what the new manager is really expected to do," said Hodgson, who was appointed in March.
Palace were three points above the relegation zone and on a 12-match winless run in all competitions when Hodgson took over from Patrick Vieira.