Last summer, Evans was linked with a transfer to either Arsenal or Manchester City before eventually remaining at The Hawthorns, but the Northern Ireland worldwide is likely to attract more interest in January.
But with City, Arsenal, Everton and West Ham all keeping tabs on the 29-year-old, Pardew admits he can not be certain of keeping his skipper.
"I'm never confident when you've got great players because other clubs want great players, so your best players are always vulnerable", he said.
Evans has 18 months remaining on his contract at the Hawthorns and is not expected to sign a new one, meaning the Black Country club need to sell now if they are to maximise his value. Jonny Evans is one of those. Of course I do.
"There was interest in him in the summer so it makes sense to stir it up".
"Jonny's dealt with it in his way".
"He was terrific for me last week, I can only go on his performance. I thought he was outstanding against Crystal Palace".
The twenty-nine year old was a target for Manchester City in the summer who, despite their superb start to the campaign could again table a bid when the transfer window reopens though they are set for face competition if they do.