The Nittany Lions dropped two spots following a series split with Clarkson over the weekend.
The four-star receiver becomes another class of 2026 commit to announce their departure.
Lucas' promotion is the only staff change Penn State will make as he takes over Terry Smith's role.
The Nittany Lions beat Northwestern in four sets, now having 10 wins on the season.
Penn State is tied at No. 17 for top U.S. public institutions.
Events on campus are open for everyone to celebrate Indigenous Peoples' Day.