The Netherlands international joined Gordon Strachan's side from PSV Eindhoven for £3.4m and has scored 38 goals in the last two seasons, helping Celtic retain the Scottish Premier League title and into the last 16 of the Champions League on two successive occasions.
Cousin saw a move to Fulham collapse earlier this year and has been linked with a move away from Ibrox this summer.
The 31-year-old has only featured once for the Ibrox side this season, as a substitute in the 1-0 win over Falkirk.
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