The match was McKennie's fourth-straight as a starter, as he has, at least temporarily, taken Weah's spot as right wing-back.
McKennie has played well during that stretch, contributing to all three goals in a win over Lazio recently before his role in Milik's finish on Tuesday.
It's been a bold decision from Massimiliano Allegri to keep McKennie at the position, one which definitely isn't his strongest, especially since it takes away his ability to be a late arriver in the box. However, McKennie has repaid his faith in recent weeks, putting in several strong performance in the unfamiliar role.
What that all means for Tim Weah, though, is an interesting storyline to watch. He's now gone four games without a start as his USMNT teammate has seemingly leapfrogged him for that starting role so early in his Juventus career. Weah looked good against Sassuolo, but McKennie remained in the XI anyway, and he certainly didn't lose ground with his performance on Tuesday.