The Wigan and Scotland midfielder is wanted by a number of Premier League clubs, and could return to the top flight in a deal worth around £7 million on deadline day
Crystal Palace are set to beat Leicester City and Burnley to the signing of midfielder James McArthur, Goal understands.
Leicester agreed a £7 million fee with Wigan to sign the midfielder, who has been with the DW Stadium side since 2010.
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Burnley also made a move for the Scot earlier in August, but were told by Wigan that the player was not for sale.
Palace are looking to make a number of signings following the arrival of Neil Warnock, who replaced Tony Pulis amid reports of a disagreement over transfer policy with chairman Steve Parish.
Wilfried Zaha has returned to Selhurst Park on a season-long from Manchester United having failed to break into Louis van Gaal's first-team plans.
And Tottenham defender Zeki Fryers has also been pictured at the Palace training ground ahead of a move away from Spurs.
The south London club have also tied down winger Yannick Bolasie to a new contract.