Alan Curbishley has been accused of making costly mistakes in the transfer market which contributed to his exit from the club.

Curbishley resigned as the club's manager on Wednesday, complaining about the club's transfer policy.

But agent Kia Joorabchian, a transfer adviser at Upton Park, said Curbishley had made life difficult for himself.

"The board left it in the hands of someone they assumed was capable, things went wrong," he told BBC Sport.

Curbishley was annoyed by the sale of George McCartney and Anton Ferdinand to Sunderland before the close of the transfer window on Monday for a combined total of around £14million.

The former Charlton boss said it had amounted to "a breach of trust and confidence" giving him "no option but to leave".

Joorabchian, who helped West Ham sign Argentine duo Carlos Tevez and Javier Mascherano in 2006, said the club had t osell players and reduce the wage bill before new signings could be made.

And the agent has said both Curbishley and former chairman Eggert Magnusson were both culpable.

"I think from the day Curbishley entered the club, he made most of the decisions with regard to the incomings of Luis Boa Morte, Nigel Quashie, Dyer and Ljungberg," added Joorabchian.

"I wasn't deeply involved at that time but it was pretty clear cut that he was very much involved in those.

"I think the board realised that there were a lot of mistakes made during that period when Mr Magnusson was in charge.

"Not to put blame on either of them but the salaries that were being given and the players that were being brought in were probably not the board's idea of taking the club forward."

Towards the end of last season West Ham had a wage bill approaching £50m a year, which left the board, according to Joorabchian, with a "difficult task" to buy new players.

"Your wage structure has to be able to cope with the players coming in and if you have a lot of players on your books with high salaries, who are probably not very productive on a day-to-day basis," he stated.

"Your first stage is to release some of that wage structure to get into the transfer market again.

"I think it's very sad what happened to West Ham in the last year, with the players and the direction which they went.

"I do feel for Curbishley because he's a manager who has resigned under pressure but, unfortunately, the game has become so competitive that I think every manager understands that there are three major issues.

"You have to succeed in the transfer window; you have to make sure you have a winning side; and - when you're at a club like West Ham - you have to play good football."