Porter and Green were both ejected after fighting during warmups prior to Sunday's 24-10 Steelers win at Cleveland.
Browns fullback Terrelle Smith was also fined $10,000 US for his part in the scuffle.
Reports claimed the combatants accused one another of spitting and later came to blows with their helmets off on the field.
Porter supposedly punched Green in the face, splitting his lip.
Coaches separated the two and both teams retreated to their respective locker rooms.
Animosity between the teams built all week because Browns defensive lineman Gerard Warren said it would be worth a fine to go after Steelers rookie quarterback Ben Roethlisberger.
with files from Sports Network
