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Cardiff seem set to confirm Russell Slade as their new manager ahead of Saturday's Sky Bet Championship home game with Sheffield Wednesday.
Slade resigned as manager of Leyton Orient on Wednesday night after the League One club had rebuffed three approaches from the Bluebirds for the 53-year-old to succeed Ole Gunnar Solskjaer.
Orient confirmed late on Wednesday they had received Slade's resignation and were consulting club lawyers over a compensation offer from the Bluebirds.
"The chairman and the CEO of Leyton Orient have received a resignation letter from Russell Slade," said the club statement.
"This has not happened by chance after the club rejected a proposal from the general manager of Cardiff City regarding the transfer of Russell Slade.
"The lawyers of the club are now studying the file."