Cops are continuing to make headway in their investigation into Nikola Jokic's brother ... telling TMZ Sports they've located the man who Strahinja Jokic punched in the face earlier this week.
A spokesperson for the Denver Police Dept. said on Thursday morning they've "been in communication" with the fan who Strahinja socked after Game 2 of the Lakers vs. Nuggets game at Ball Arena on Monday night.
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The rep did not reveal, however, if the man is seeking to press charges -- or if he's formally filed a police report.