The defender has been linked with a move to south London but the former forward says it would be a huge blow to lose him.
The Wales defender has been linked with a move to south London, with Alan Pardew’s side keen on signing him ahead of the Premier League season. A fee of £12 milllion has been reported, as that is the price Arsenal were quoted last summer, according to The Daily Mail.
That price is unlikely to have fallen given his solid season in Garry Monk’s impressive first full season in charge of the Premier League side and Hartson says it would be a massive blow were he to leave the Swans.
"I hear Crystal Palace are chasing Wales defender Ashley Williams," he wrote on Kicca.
"Ashley is a great captain who has been a rock for Swansea. He was also a great help to Garry Monk when he was settling into the job of manager. It would be massive blow to Swansea if he left the club."
An unlikely move?
Losing Williams to a Premier League rival would certainly be a blow to Swansea ahead of the new season.
The defender has been the bedrock of the Swans side over recent years, proving himself a more than capable Premier League defender for Brendan Rodgers, Michael Laudrup and now Garry Monk.
Crystal Palace, meanwhile, finished eight points behind Swansea last season - would it be that much of a step up?
Both of those reasons, then, may make a move unlikely, although in the transfer window anything can happen.