Mckenna is the fourth consecutive Nittany Lion to be named a Big Ten Star of the Week this season.
Former Penn State quarterback Beau Pribula was carted off the field in Missouri's loss to Vanderbilt.
The award comes after two standout performances in wins against Wisconsin and Northwestern.
The four-star receiver becomes another class of 2026 commit to announce their departure.
Allar is confident in the team's leaders to rebound ahead of Northwestern.
The Nittany Lions dropped three spots.