Duffy was following the Scottish Premiership game between Motherwell and Celtic at the Fir Park Stadium on Sunday afternoon for BBC Sport.
Rogic started the match and played for the entire 90 minutes, as it ended in a goalless draw.
"Celtic's final pass, the bit of link-up play, one-twos around the box - they've only had one incisive pass in the second half into Dembele's feet,” Duffy told BBC Sport.
“They really haven't been anywhere near their best in that final third. Their movement, Rogic has been too deep, he has got to be a lot closer to Dembele to link the play up. He's too detached.”
Celtic were expected to win against Motherwell, especially as they headed into the match on Sunday afternoon on the back of a 3-2 victory over Old Firm rivals Rangers at Ibrox in the Scottish Premiership.
Brendan Rodgers’s side's performance on Sunday afternoon was disappointing, and Rogic was far from his best.
Celtic are at the top of the league table at the moment with 68 points from 30 matches.
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