Pardew is due to speak with owner Mike Ashley in the next few days to plot a way forward for the club, who struggled badly towards the end of the season and spent the last few weeks fighting for their Premier League lives.
He is hopeful of bringing in 'two or three' players to strengthen a squad that went through a big overhaul in January, but it is the worry about possible departures that will keep him on his guard.
Captain Fabricio Coloccini has been linked with a move back to Argentina, more for family reasons than anything else, and there is expected to be significant interest in Yohan Cabaye and Hatem Ben Arfa, even though both players have pledged their future to the club.
"We're one of those clubs where we're liable to lose one of our great players to a Champions League team through finance and sometimes the will of the player," Pardew told the Gazette.
"You can't keep a player who doesn't want to stay.
"Having said that, it's going to be very difficult for any club to get a player out of here unless it's a serious or big bid."