The Brighton winger could have joined Leeds once upon a time.
Knockaert was on trial at Leeds, although a move didn't materialise.
After a few years at different clubs, including Leicester City, the 24-year-old will now be facing Leeds on Monday night with Brighton, having signed for them in January.
Demougeot told the Argus: "I thought we had lost him to Leeds because I had already been following him for a while. I was on to him as soon as he arrived at Lesquin.
"He was on trial at Leeds. That didn’t go so well. He preferred to return to France. We took him on trial in July, signed him in December and we allowed him to finish his season at Lesquin before joining us at Guingamp in the summer of 2009."
Leeds could do with a talented wide man, of course. They do have Stuart Dallas - and did bring in Mustapha Carayol on loan at the same time in January.
But there is always room for improvement for a Championship side, especially at Elland Road.
Leeds will be up against it at Brighton on Monday night, with Chris Hughton's men very much in form. Steve Evans has emphasised the need to secure a few wins to guarantee safety for United. But will he still be waiting for one after the Brighton game?