The incident reportedly took place Thursday night at a building on campus.
“We are aware of the egg throwing situation that occurred Thursday evening and will determine the appropriate measures for the four squad members involved," coach James Franklin said in an email through Assistant Athletic Director Jeff Nelson.
Smith, a safety, played in three games on special teams as a freshman, and Laurent is currently backing up senior Donovan Smith at center. Defensive end Sickels and tight end Wilkerson have yet to play for the Nittany Lions.
Penn State 4-3 (1-3 Big Ten) hosts Maryland on Saturday.