The rookie tight end totaled 29 receptions for 331 yards and a touchdown this season.
The Nittany Lions' jump in the ranking came following their victory over No. 2 Nebraska.
Roberson spent three years with Penn State before transferring to UConn.
The Nittany Lions have been No. 12 for the entire season.
Cael Sanderson said Nagao had "a major surgery" and won't return "anytime soon."
Cross has only played in five games over his three-year career.
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