Less than 24 hours ago, Malky Mackay looked set for a return to Premier League management with Crystal Palace following his acrimonious departure from Cardiff City last December. However the offer has now been taken off the table following the intervention of Cardiff City owner Vincent Tan.

The exact details are as yet unclear. However, Wales Online newspaper reports that Cardiff’s Malaysian tycoon owner sent a dossier detailing Mackay’s alleged misconduct during his time with the Welsh club to the FA prompting Crystal Palace co-owner Steve Parish to take action.

The relationship between Tan and Mackay has long been known to have been a difficult one with neither party being able to work harmoniously particularly once the Welsh side made it to the Premier League.

Vincent Tan was quoted as saying, “Indeed far too much dirty linen has been exposed to the public gaze. But, I stress, not by me” in the aftermath of Mackay’s departure with the details continuously limited ever since.

Mackay then pursued a lengthy case attempting to receive compensation only to rather surprisingly drop the case completely in May following an agreement on a private settlement with Vincent Tan.

The matter appeared to be closed. But when Tony Pulis sensationally walked out on the Selhurst Park club just two days before the start of the Premier League season, Mackay was immediately installed as the favorite.

The Mirror reports that the dossier handed to the Football Association by Tan includes details of agents and lawyers within the game whom are believed to have been involved with commission payments that Tan refused to pay. Plus, The Mirror newspaper adds, “The FA have received the dossier, which allegedly also contains evidence of racist, sexist, and homophobic texts and emails.”

Cardiff has also brought into question the amount paid to agents in several of the deals completed during Mackay’s time in charge.

In an already murky saga, the waters are likely to be muddied even further in the near future after it was made public last week that Crystal Palace had been fined £10k following the ‘spygate’ incident involving the club’s fixture with Cardiff City last season.

Cardiff City is expected to launch legal action against Crystal Palace following that ruling with many prepared for a similar drawn out process to the one we saw between West Ham United and Sheffield United over the Hammers’ illegal use of Javier Mascherano and Carlos Tevez and the Yorkshire club’s eventual relegation in the 2006-07 season.

Today’s developments come as a further blow to Crystal Palace’s preparations for the Premier League season with Keith Millen once again expected to be in charge for the Eagles’ clash with West Ham on Saturday.

It is believed Steve Parish will now turn to Tim Sherwood or Martin Jol following Glenn Hoddle’s refusal to enter talks after having just joined QPR as a first-team coach.