It was believed that Cousin only played once for Lens before his move to Ibrox, a 21-minute substitute appearance in a 1-0 defeat to Bordeaux at the start of August.
However, it emerged that Cousin also played 90 minutes for the club - managed by Roux at that time - against Ukrainian side Chornomorets in an InterToto Cup tie.
"They are being stupid and to be honest, I feel they are wasting FIFA's time.
"Everyone knows that Daniel played for us and Rangers.
"There is a great invention called the internet which makes it easy to check these things.
"I'm sure most younger people are more than capable of using it and it states clearly that Daniel played for us - not once, but twice."