EXCLUSIVE By Graeme Bailey Follow on Twitter
McArthur joined Palace last summer on deadline day and became a key player in the team and Alan Pardew - who took charge in January - sees him as a vital part of his first team.
Pardew has now told the club's hierarchy to do everything they can to keep McArthur, with a number of Premier League clubs ready to make offers for the midfielder.
Norwich City have lined up a move for McArthur, and West Ham - who are lining up replacements for Alex Song - have been asked to be kept informed of the situation.
Everton - who could see James McCarthy leave this summer - are also keeping tabs on McArthur.
A source close to Palace told Goal: "The club is braced for bids, but the gaffer [Alan Pardew] is determined to keep him.
"There is no doubt the player is happy but the interest elsewhere means they need to try and tie him down to a new deal to put off the other clubs."