Walker has made 22 consecutive starts at left tackle for the Nittany Lions.
Operations that would normally require an overnight stay will remain postponed through the end of January.
Four Nittany Lions received top-five rankings in their respective weight classes before taking the mat this weekend.
While he's listed as a safety, Hartlaub has served as a special teams ace for the Nittany Lions over the past few seasons.
Analysts expect a bounce-back season for Penn State football in 2021.
Applications are open for Penn State's student-selected trustee and the student selection committee.
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