Could you please confirm which version of Illustrator CC are you using?
Also, please make sure your image has been selected since if the image is deselected, you won't get the option for 'crop image'.
You need a newer version for the Image Crop feature.
At least 21.1.0
Illustrator version 21.0.0 damn... anyway thanks for the answers.
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That's an easy update you have already paid for. Use the CC management app to do the update.