Do you get mastery points for champions you don't own?

Hi, I'm playing Coop vs. AI matches to learn Lucian. I haven't bought him yet, but he's in the free champions rotation this week. My plan was to play Coop vs. AI until I get him to mastery level 2 and then start with normals. However, after four matches it looks like I'm not getting any mastery points. In my champions list, when I check the mastery points for Lucian it says 0 / 0 points. Do you know why? Is it because I haven't bought him, because I'm playing Coop vs. AI, something else...?
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