Fuchs is the second former Penn State commit to flip to another Big Ten program since James Franklin's firing.
The Nittany Lions fall behind Minnesota-Duluth and Denver in the latest USCHO poll.
Penn State takes their first loss in conference play against the top-ranked Spartans.
The sophomore forward leads the nation with 11 goals as the Nittany Lions gear up for No. 1 Michigan State.
The Behind-the-Back Boys will all be featured at the Spengler Cup.
There's a unique opportunity to create an environment not seen at Penn State in nine years on Saturday.