The 23-year-old, who is the son of former Wimbledon forward Alan, joined the west Londoners aged nine and went on to graduate from their academy system.
However, Cork never made a first-team appearance for a Blues side awash with star names following the arrival of billionaire Roman Abramovich.
He went on loan to six different clubs in a bid to impress before eventually making a permanent move to Southampton in 2011. Cork gets the opportunity to face Chelsea for the first time in an FA Cup third round tie at St Mary's and admits it is a special game for him.
"I am looking forward to playing against them," he said.
"I never got the opportunity to play with them when I was there so hopefully we can go and put a good performance in. I am looking forward to seeing some old faces.
"The main person I still speak to there is Ryan Bertrand. He was sort of the same age as me and has had some good performances and been able to get a few little runs in the team.
"It will be good to see him and a few of the older players as well as they were quite good to me when I was at Chelsea."